Scriptorium of Palermo (?), 12th c.
Martyrologium Usuardi
with obituary annotations of kings and queens of Sicily of 13th-14th c. see for Constance of Aragon June 23, vigilia Nativitatis S. Ioannis Baptistae, at p. 115:
ON THE DAY 23 OF THE MONTH OF JUNE ON THURSDAY
IN THE YEAR 1222 FROM THE INCARNATION OF OUR
LORD JESUS CHRIST TENTH INDITION CONSTANCE MOST
ILLUSTRIOUS ROMAN EMPRESS ALWAYS AUGUST AND MOST
GLORIOUS QUEEN OF SICILY DIED. SHE WAS PLACED IN THE
SARCOPHAGUS ON THE DAY 16 OF THE MONTH OF JULY OF
THE SAID INDITION
parchment manuscript (25×15 cm)
Palermo, “L. Sciascia” Municipal Library, 2 Qq E 20

The Martyrology (Focus cat. 17) on display was produced in a southern Italian, Calabrian or Sicilian monastic scriptorium (Palermo? see cat. 2) and was used by the clergy of the Palatine Chapel of Palermo (located inside the Royal Palace), where it was first documented in 1309.
The manuscript is particularly relevant because it includes annotations dating from the twelfth to the second half of the thirteenth century, which report the dates of the death of kings, queens, members of the royal family, the court and the clergy of Palermo.
The first name that is mentioned is the Great Count Roger I of Hauteville, founder of the Sicilian royal dynasty, who died on June 22, 1101. The volume started to be written in this year.
The Great Count, father of Roger II, first King of Sicily and grandfather of Constance of Hauteville, died sixteen years after his elder brother Robert, Duke of Apulia and Calabria (died in 1085), who had been protagonist with Roger of the Christian reconquest of Sicily from the Muslims.
Among the notes in the manuscript on the deceased sovereigns we read the names of Adelasia del Vasto Queen of Jerusalem (1118), third wife of the Great Count, Roger II (1154) and the first wife of the latter, Elvira of Castile (1135).
The death and deposition in the sarcophagus of Emperor Frederick II (1250) and his first wife Constance of Aragon (1222) are also mentioned.