Omar il Grande, LII; 56, 57, 60, 62, 64, 65, 66, 67, 68, 70, 71, 79, 80, 81, 109, 134, 476, 477, 478; II, 17, 18, 26, 30, 105, 123, 279, 359, 360, 623, 645; III, 826, 855.
Omar-ibn-Abd-Allah (Abu-Hafs), II, 516, 536.
Omar-ibn-Abd-el-’Azîz, califo omeiade, III, 828.
Omar-ibn-Ali, da Siracusa, II, 511, v. Othman-ibn-Ali.
Omar-el-Bellûti (Abu-Hafs), 162, 163, 164.
Omar-ibn-Crisobolli, III, 206.
Omar-ibn-Fulfûl (Abu-Hafs), III, 423.
Omar-ibn-Hasan (Abu-Hafs), contemporaneo di re Ruggiero, III, 462, 758.
Omar-ibn-Hasan-ibn-Setabrîk (Abu-Hafs), II, 540.
Omar-ibn-Hasan (Abu-Hafs), spagnuolo, II, 523.