Onomasticon Arabicum (OA) is a long-living database project. This new online-version informs on more than 15000 scholars and celebrities from the first Muslim millenary. Its entries in Arabic are compiled from ancient biographical dictionaries, a veritable treasure of Islamic culture. Crossed search allows separate interrogation on any of the different elements of the Arabo-Muslim names, dates and places, reconstructing the identity of a person, trace ways of knowledge transmission and frame historical contexts.