Experts searching for the remains of Miguel de Cervantes said Monday that they found wooden fragments of a casket bearing the initials "M.C." with bones in and around them in a crypt underneath the chapel of a cloistered convent in Madrid.

Archaeologists made the find over the weekend during excavations to solve the centuries-old mystery of where the famed Spanish writer was laid to rest. The initials on a plank of the coffin were formed with metal tacks embedded into the wood.

Spain Cervantes Bones

The initials "M.C." were formed on a plank of the coffin with metal tacks. (Aranzadi Science Society/AP Photo)

The bones of at least 10 people were found inside the niche containing the broken wooden planks of the coffin, though some of the remains belonged to children, said forensic anthropologist Francisco Etxeberria, who participated in the autopsy that confirmed the suicide of former Chilean president Salvador Allende.

Etxeberria and others will now start examining the bones to try to determine whether Cervantes' are among them. Cervantes was 69 when he died and investigators have solid clues to work with as they conduct their probe.

The investigation will refer to the author's portraits and his own stories, in which he relates that shortly before dying he only had six teeth.

But the most obvious marks will be the battle wounds that Cervantes sustained.

Miguel de Cervantes

Spanish novelist Miguel de Cervantes (1547 - 1616), circa 1600. (Hulton Archive/Getty Images)

In 1571, the writer was wounded in the Battle of Lepanto, which pitted Ottoman Turkish forces against the Holy League, led by Spain. Aboard the ship La Marquesa, Cervantes was hit with three musket shots, two in the chest and one in his hand.

He spent several months in a hospital in Sicily, but managed to recover.

Cervantes is a towering figure in Spanish culture. His novel The Adventures of the Ingenious Nobleman Don Quixote of La Mancha changed Spanish literature.

The Don Quixote author was buried in 1616 at Convent of the Barefoot Trinitarians in Madrid's historic Barrio de las Letras, or Literary Quarter. But the exact whereabouts of his grave within the convent chapel were unknown.