Roger I of Sicily in the context of "Cappella Palatina"

Roger II or Roger the Great (Italian: Ruggero II, Sicilian: Ruggeru II, Greek: Ρογέριος; 22 December 1095 – 26 February 1154) was King of Sicily and Africa, son of Roger I of Sicily and successor to his brother Simon. He began his rule as Count of Sicily in 1105, became Duke of Apulia and Calabria in 1127, then King of Sicily in 1130 and King of Africa in 1148.

Jordan of Hauteville (c. 1060–1092) was the eldest son and bastard of Roger I of Sicily. A fighter, he took part, from an early age, in the conquests of his father in Sicily.

Jordan is named as son of Count Roger's first marriage in Europäische Stammtafeln but, according to Geoffrey Malaterra, his mother was a concubine of Roger I. Her origin is unknown.

Tancred (fl. 1104) was the Count of Syracuse and a member of the Hauteville family. He was appointed by his relative Roger I of Sicily to govern one of the first and only feudal counties created in Sicily after the Norman conquest. His predecessor was Roger's son, Jordan. His descendant, Simon, still ruled Syracuse in the middle of the twelfth century.

Simon (fl. 1162) was the Norman Count of Syracuse and a member of the Hauteville family. He may be an illegitimate son of Roger II of Sicily, but more likely a son of Henry, Count of Paterno, the brother-in-law of Roger I. He was probably a descendant of his predecessor Tancred.

In 1162, when Frederick Barbarossa was seeking allies for a planned invasion of the Kingdom of Sicily, he made a treaty with the Republic of Genoa, offering them the entire Ligurian coast and the lands of Simon in Sicily. These lands included the cities of Syracuse and Noto and 250 knight's fees (caballariae) in the fertile plain around Noto, the Val di Noto. When the Emperor Henry VI reissued his father's charter to Genoa on 30 May 1191, he retained the promise of Simon's lands, even though Simon was by then dead.

The Norman invasion of Malta was an attack on the island of Malta, then inhabited predominantly by Muslims, by forces of the Norman County of Sicily led by Roger I in 1091. The invaders besieged Medina (modern Mdina), the main settlement on the island, but the inhabitants managed to negotiate peace terms. The Muslims freed Christian captives, swore an oath of loyalty to Roger and paid him an annual tribute. Roger's army then sacked Gozo and returned to Sicily with the freed captives.

The attack did not bring about any major political change, but it paved the way for the re-Christianization of Malta, which began in 1127. Over the centuries, the invasion of 1091 was romanticized as the liberation of Christian Malta from Muslim rule, and a number of traditions and legends arose from it, such as the unlikely claim that Count Roger gave his colours red and white to the Maltese as their national colours.

Simon of Hauteville (1093 – 1105), called Simon de Hauteville in French and Simone D'Altavilla in Italian, was the eldest son and successor of Roger, Grand Count of Sicily, and Adelaide del Vasto, under whose regency he reigned.

The chronicler Alexander of Telese relates an incident that took place during the childhood of Simon and his brother, Roger:

Gallo-Italic of Sicily, (Italian: Gallo-italico di Sicilia) also known as the Siculo-Lombard dialects, (Italian: Dialetti siculo-lombardi) is a group of Gallo-Italic languages found in about 15 isolated communities of central eastern Sicily. Forming a language island in the otherwise Sicilian language area, it dates back to migrations from northern Italy during the reign of Roger I, the Norman Grand Count of Sicily, and his successors.

Towns inhabited by the new immigrants became known as the "Lombard communities" (Latin: oppida Lombardorum, Sicilian: cumuna lummardi). The settlers, known as the Lombards of Sicily, actually came principally from the Aleramici fiefdoms of southern Montferrat, comprising today south-eastern Piedmont and north-western Liguria, "Lombardy" being the name for the whole of northern Italy during the Middle Ages. In addition to a common place of origin, the colonizers brought their Gallo-Italic languages. These languages added to the Gallic influence of the developing Sicilian language (influences which included Norman and Old Occitan) to become the Gallo-Italic of Sicily language family.