The fight over the final disposition of King Richard III's 528-year-old remains has escalated to the point that people are sending hate mail to York's cathedral, the police are being called in to investigate, and a member of Parliament is pleading with the rivals to avoid sparking another "War of the Roses."

On strictly legal grounds, the matter was resolved even before the remains were unearthed in a parking lot near Leicester Cathedral last year. Britain's Justice Ministry granted researchers from the University of Leicester a license to conduct the excavation there and to determine the disposition of any human remains found there.

Last month, the researchers announced that a skeleton found at the site belonged to Richard III, based on DNA tests. The discovery resolved a longstanding mystery over what happened to Richard's remains after his death in the Battle of Bosworth in 1485. That battle marked a turning point in the Wars of the Roses, a decades-long contest between the houses of Lancaster and York for the English throne. 

Richard III has gotten a bad rap through the centuries — in part because William Shakespeare's play about the monarch cast him as a hunchbacked villain. But historians say he wasn't that terrible of a guy, and since last month's announcement, Richard III's fans have been arguing over whether he should be reburied in Leicester, where he was found; in York, where he had family ties; or in London's Westminster Abbey, the resting place for many of England's kings.

The University of Leicester is already working to arrange a burial at Leicester Cathedral next year, but some of the opponents of that plan — including nine descendants of Richard III's siblings — have taken up York's case. The arguments are apparently getting uglier: Hugh Bayley, a member of Parliament representing York Central, said that York Minster's dean, Vivienne Faull, has received some letters "so extreme that she has referred the correspondence to the police."

Faull was dean of Leicester Cathedral before coming to York, and she has shied away from contesting Leicester's claim to the remains. "It has been suggested that opponents have accused her of bias because of her previous links to Leicester Cathedral," The Telegraph reported.

The Yorkshire Post quoted a spokesman for the Dean and Chapter of York as confirming that "a small number" of the letters relating to the fuss over Richard III's remains have been abusive. "These have been passed to the Minster Police, and they continue to monitor the situation closely," the spokesman was quoted as saying.

The British government's current view is that Richard III's final disposition is up to the University of Leicester, but during Tuesday's speech in the House of Commons, Bayley urged the government to establish an independent commission to decide the matter. In the meantime, he called for what Shakespeare might have termed "some little pause" in the battle. 

“I would say to everybody — calm down," Bayley said. "Let us all respect the memory of a former king of our country, and let us discuss, in a dignified and sober way, where his remains should finally be put to rest. We do not want to reignite the Wars of the Roses.”

More about Richard III:

• Study suggests Richard III spoke with a lilt
• King Richard III's face revealed after 500 years
• Richard III's 'discovery' was reported in 1935, too

Alan Boyle is NBCNews.com's science editor. Connect with the Cosmic Log community by "liking" the log's Facebook page, following @b0yle on Twitter and adding the Cosmic Log page to your Google+ presence. To keep up with Cosmic Log as well as NBCNews.com's other stories about science and space, sign up for the Tech & Science newsletter, delivered to your email in-box every weekday. You can also check out "The Case for Pluto," my book about the controversial dwarf planet and the search for new worlds.

Nine distant relatives of King Richard III are demanding that the British government reverse its decision to have his skeleton reburied at Leicester Cathedral, near the parking lot where it was found, and give it a resting place in York instead.

The open letter, published late Sunday by British newspapers such as The Telegraph and the Daily Mail, is just one of several efforts seeking a burial at York Minster for the more than 500-year-old remains, which were discovered last year by researchers from the University of Leicester. This month, the researchers said DNA analysis and other forensic tests proved "beyond reasonable doubt" that the skeleton was that of Richard III.

The English monarch reigned for just two years before he was killed in battle in 1485, but he was immortalized in William Shakespeare's play, "Richard III," in which he was portrayed as a hunchbacked villain. Richard III's legions of modern-day fans say he wasn't really all that bad — and the row over what to do with his bones has added a new twist to the drama.

"We, the undernamed, do hereby most respectfully demand that the remains of King Richard III, the last Plantagenet King of England and our mutual ancestor, be returned to the city of York for formal, ceremonial reburial," the statement from his relatives says. "We believe that such an interment was the desire of King Richard in life and we have written this statement so that his wishes may be fully recognised and upheld. King Richard III was the last King of the House of York and the last of the Plantagenet dynasty which had ruled England since the succession of King Henry II in 1154.

"We, the undernamed blood descendants, unreservedly believe that King Richard is deserving of great recognition and respect and hereby agree to dutifully uphold his memory.

"With due humility and affection, we are and will remain His Majesty’s representatives and voice."

The statement was signed by nine individuals who have traced their ancestry back to Richard III's siblings. The nine signers are Charles E. Brunner, Stephen Guy Nicolay, Vanessa Maria Roe, Jacob Daniel Tyler, Paul Tyler, Raymond Torrence Bertram Roe, Linda Jane Roe, Eleanor Bianca Lupton and Charlotte Jane Lupton. Richard died childless and thus has no direct-line descendants.

Even before the remains were found, the British Ministry of Justice granted a license putting the University of Leicester in charge of the parking-lot dig and the disposition of any remains found there."The University of Leicester specified in its application that reinterment would occur in Leicester Cathedral if the remains were proved to be those of King Richard III," the institution said in a statement.

The university is currently working with the cathedral and Leicester's city council on plans for his reburial by August 2014. In the meantime, researchers are continuing to study the remains.

The long lead time means that the tug of war between Leicester and York, two cities that are 100 miles (160 kilometers) from each other, could continue for months. There are even those who want to see the remains interred in London's Westminster Abbey. But the nine relatives behind this week's open letter have no more standing than the other descendants of Richard III's family, who doubtless number in the thousands by now.

In that light, Leicester seems to have the strongest case, by virtue of legal grounds as well as the less rigorous "finders, keepers" rule and the dictum that possession is nine-tenths of the law. Do you disagree? Feel free to weigh in with your comments below.

More about Richard III:

• Study suggests Richard III spoke with a lilt
• King Richard III's face revealed after 500 years
• Richard III's 'discovery' was reported in 1935, too

Alan Boyle is NBCNews.com's science editor. Connect with the Cosmic Log community by "liking" the log's Facebook page, following @b0yle on Twitter and adding the Cosmic Log page to your Google+ presence. To keep up with Cosmic Log as well as NBCNews.com's other stories about science and space, sign up for the Tech & Science newsletter, delivered to your email in-box every weekday. You can also check out "The Case for Pluto," my book about the controversial dwarf planet and the search for new worlds.

Experts say DNA analysis supports their claim that the bones dug up last year under a parking lot in the English city of Leicester are the last mortal remains of England's King Richard III.

"It's the academic conclusion of the University of Leicester that beyond reasonable doubt the individual exhumed at Greyfriars in September 2012 is indeed Richard III, the last Plantagenet king of England," Richard Buckley, the project's lead archaeologist, said during a Monday news briefing in Leicester.

The project used 21st-century forensic science to solve a 500-year-old mystery surrounding one of William Shakespeare's best-known villains. Shakespeare's play, "Richard III," made the king out to be a scheming monster who killed children to get to the English throne. The bard gave Richard III dramatic lines that are still evoked today, ranging from "the winter of our discontent" to "A horse! A horse! My kingdom for a horse!"

In real life, Richard III's battlefield death in 1485 marked the end of England's Wars of the Roses, a decades-long conflict between the houses of York and Lancaster. Tradition held that he was buried in the choir of Leicester's Greyfriars Church, but the precise location of his remains was lost in the mists of time. Some even speculated that Richard's bones were thrown into the River Soar during Henry VIII's reign.

It was only in the past few years that archaeologists have been able to zero in on the location of the Greyfriars site again. Last year, a team led by the University of Leicester excavated a city parking lot and found a wealth of intriguing evidence — including a skeleton with a battle-scarred skull and a spine that was curved due to scoliosis. There was no evidence of a coffin, a shroud or clothing that was buried with the body.

All those clues suggested that the skeleton could have been that of the historical Richard III, but to firm up the connection, scientists put the bones through genetic tests, radiocarbon dating and more detailed osteological analysis.

"The skull was in good condition, although fragile, and was able to give us detailed information about this individual," University of Leicester archaeologist Jo Appleby reported Sunday in a news release. During Monday's news briefing, Appleby said experts identified 10 injuries to the bones, including eight wounds to the skull and "postmortem humiliation injuries." Such wounds are "highly consistent" with the accounts of Richard III's death, she said.

"Historical sources tell us that Richard's body was stripped," hacked and put on public display after the battle, Appleby noted.

The skeleton's relatively delicate structure was consistent with descriptions of Richard III's physical appearance, University of Leicester historian Lin Foxhall said. 

University of Leicester

A photo shows the Greyfriars skeleton lying in the site where it was found.

University of Leicester

The Greyfriars skeleton is laid out for forensic analysis. Experts believe the foot bones were separated from the rest of the body after burial.

University of Leicester

The Greyfriars skull was found by researchers during a search for the remains of King Richard III.

Buckley told journalists that the position of the hands suggested that they might have been bound together. Initially, the team reported that an arrowhead was found among the bones, but Buckley said a closer look determined that the object was a nail that was apparently mixed in with the remains.

Radiocarbon dating showed that "the individual could have died in 1485," Buckley said. Two tests yielded dates possibly ranging from 1455 to 1540.  

The team's genetic analysis reinforced the link to Richard III: DNA was extracted from bone samples and compared with modern-day mitochondrial DNA from two direct descendants of Richard III's family, including an anonymous donor as well as Michael Ibsen, a Canadian-born cabinetmaker who is a 17th-generation descendant of Richard III's eldest sister, Anne of York.

"The DNA evidence points to these being the remains of Richard III," said Turi King, a geneticist at the University of Leicester. She said additional DNA tests were still in progress.

Genetic matches based on mitochondrial DNA aren't as clear-cut as, say, a paternity test — but a mismatch would have ruled out any family connection. Similar techniques were used to identify the remains of Czar Nicholas II and other members of Russia's royal family, who were killed in 1918 during the Russian Revolution.

A documentary about the Leicester project, "Richard III: The King in the Car Park," is to be aired by Britain's Channel 4 on Monday night. But this isn't the end of the story. For one thing, the results announced on Monday will have to go through review and publication in scientific journals. The announcement also could lead to a reassessment of Richard III's reign, which some historians say wasn't nearly as terrible as Shakespeare made it out to be.

"I think this could be the moment where Richard III's reputation actually turns," British historian Andrew Roberts told NBC News. "This could be the moment where we look at his achievements and the positive aspects of Richard III, and don't just see him as one of the old Dark Ages kings."

And then there's the matter of reburying the remains: Authorities said the skeleton would get a proper interment in Leicester Cathedral, not far from the parking lot where it was found. The cathedral's canon chancellor, David Monteith, said planning for an interment ceremony in 2014 has already begun, and he expressed the hope that after more than 500 years, Richard III "may come to rest in peace, and rise in glory."

More about the search for Richard III:

• PhotoBlog: Reconstruction reveals Richard III's face
• Skeleton was almost destroyed in 19th century
• Dispute erupts over skeleton's future resting place
• Hunt for king's grave turns up garden

Alan Boyle is NBCNews.com's science editor. Connect with the Cosmic Log community by "liking" the log's Facebook page, following @b0yle on Twitter and adding the Cosmic Log page to your Google+ presence. To keep up with Cosmic Log as well as NBCNews.com's other stories about science and space, sign up for the Tech & Science newsletter, delivered to your email in-box every weekday. You can also check out "The Case for Pluto," my book about the controversial dwarf planet and the search for new worlds.