Bahrain's history had opened it to a multitude of cultural influences, and when the first Moslems arrived in the seventh century, there were already a number of other faiths, including Christians, Jews and Zoroastrians.
The then ruler of Bahrain, Munthir bin Sawa, however was drawn towards Islam, and following contacts with Prophet Mohammed through his companion Abialaía Ali Hadhrami, he and his followers soon embraced the faith.
Work on the Al Khamis Mosque, still standing today, was started around this time, though it would not be complete until two centuries later and its distinctive twin minarets erected even later, around the 15th century.
The mosque is one of the most ancient in the Arab world, and stands testimony to one of the defining periods of Bahrain's history.
In search of the Garden of Eden
Life before oil
Bahrain's First Family