Doubt - and a reportedly royal severed head - haunts a murky corner of forensic science these days, as researchers squabble over an unearthed packet of mummified remains thought to have belonged to King Henry IV of France.
Three years ago, French researchers declared that a centuries-old mummified head was that of the beloved King Henri IV. But now a new study says, "Non!"
The identification of King Richard III's skeleton is the latest coup by forensic scientists who use radiocarbon-dating, DNA analysis, 3D scanning and other hi-tech tools to unlock the secrets of the long-dead.
Two centuries after the French people beheaded Louis XVI and dipped their handkerchiefs in his blood, scientists believe they have authenticated the remains of one such rag kept as a revolutionary souvenir.
He was one of France's most adored kings, a monarch known as "le bon roi Henri" (good king Henri), who promoted religious tolerance, was a hit with the ladies and was the first to dream of putting a chicken in every pot.