Anthropological examination has revealed the skeleton belonged to a 40-year-old male who was 5 feet, 5 inches tall -- and who was used to kneeling in prayer.
Analysis has so far revealed a high concentration of arsenic in the bones, which could support the poisoning theory, although many drugs at that time were arsenic based.
Not much evidence has emerged about Henry's demise by malaria, which has long been considered by many scholars a likely cause of death.
As for the silk cloth, it is unclear how it ended up in the coffin.
"In 1921, it was described as a piece of cloth with little value," Brunori said. "Instead it's a unique example of the noble production of silk textiles dating back to the beginning of the 14th century."
More than 10 feet long and 4 feet wide, the exquisitely woven cloth features horizontal bands of around 4 inches showing alternating colors, a reddish nut-brown (originally red) and blue.
"The blue bands are embroidered in gold and silver with pairs of lions facing each other, while an elaborated monochromatic tone-on-tone decoration, currently indecipherable, is visible on the reddish bands," Brunori said.
A crimson strip edged with yellow, placed at the top of the piece of fabric, bears traces of an inscription. Other unique features are the finished edge along the length of the fabric -- to keep it from unraveling -- and the checked bands at the shorter ends marking the beginning and end of the piece.
"The chequered starting and finishing borders are typical of this period," leading textile expert Lisa Monnas told Discovery News.
"For textile historians, it is exciting to see a complete loom width of silk fabric from this date, and, if it has both starting and finishing borders, a complete piece. It would be even more exciting if the inscription could be deciphered," she added.
According to Brunori, the lions, the most characteristic emblem of sovereignty, as well as other decorations symbolizing power, indicate a clear link to the emperor.
"What makes this cloth unique is its size, the very high level of craftsmanship and its amazing preservation," Brunori said.
According to Gale Owen-Crocker, professor of Anglo-Saxon Culture at the University of Manchester and an expert on medieval clothing and textiles, such silks were treasured possessions of the rich and royal.
"Expensive silks have been found in medieval royal and ecclesiastical graves. St. Cuthbert, the seventh-century English ascetic and bishop had several precious silk cloths added to his tomb over a period of centuries," Owen-Crocker told Discovery News.
She noted that the body of King Cnut IV of Denmark, murdered in 1086, was relocated in 1100, when his shrine was constructed as a bed, with a yellow silk quilt on which the body was laid, and a silk pillow.
"The fascinating thing to me is the way they gave such precious things to the grave. Even though as Christians they believed in the eternal life of the spirit, not the body, they still treated the body with the utmost luxury," Owen-Crocker said.