Baldwin I of Jerusalem
Boniface was also the guardian of his brother Manfred's children: Henry del Vasto, who married Flandrina, a daughter of Roger I of Sicily, and Adelaide del Vasto, who was Roger's third wife. Following Roger's death, Adelaide married Baldwin I of Jerusalem. Two of Manfred's unnamed daughters married Roger I of Sicily's sons from previous relationships, Jordan, Count of Syracuse, and Geoffrey, Count of Ragusa (who may have died before the marriage actually took place).