Sibylla of Acerra (1153–1205) was Queen of Sicily as the wife of King Tancred. After Tancred's death, she was regent in 1194 for their son, King William III. She was a member of the noble d'Aquino family, and the sister of Count Richard of Acerra.
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Life
Tancred was always in a struggle with his aunt Empress Constance and her husband, the Holy Roman Emperor Henry VI, who had been claiming the Kingdom of Sicily since Tancred's accession. In 1191 Henry attempted to invade Sicily but failed and retreated, while Constance was left behind and captured.
Tancred initially placed Constance at Palermo under the supervision of Queen Sibylla, with Constance eating with Sibylla and sleeping in her bedroom. Sibylla strongly opposed Tancred honoring Constance, believing this would implicitly acknowledge the claim of the latter. Finding the local populace was sympathetic to Constance with whom she once quarreled, Sibylla suggested Constance be put to death, but Tancred, worrying this would harm his popularity, and viewing Constance's hostageship as a chance to force Henry into a truce, did not agree. So, as suggested by Tancred, she went for a discussion with Chancellor Matthew d'Ajello on where to imprison Constance, and in her presence Matthew wrote a letter managing to persuade Tancred to imprison the empress in the Castel dell'Ovo at Naples, a castle on an island surrounded by water. However, under pressure from Pope Celestine III, Tancred was forced to send Constance to Rome in exchange for recognition from the Pope; en route, Constance was freed by German soldiers, in the summer of 1192.
Tancred died in February 1194 and the Kingdom of Sicily passed to his young son William III with Queen Sibylla as regent. Sibylla also tried to ensure that Pope Celestine III would crown William III, age eight. When Henry VI crossed the Strait of Messina in autumn 1194, Sibylla negotiated an agreement whereby William III, who had been whisked off to safety, should retain the County of Lecce and Principality of Taranto.
