Īśvara (Sanskrit: ईश्वर) is a concept in Hinduism, with wide range of meanings that depend on the era and the school of Hinduism. In ancient texts of Indian philosophy, depending on the context, Īśvara can mean Supreme Soul, ruler, lord, king, queen or husband. In medieval era Hindu texts, depending on the school of Hinduism, Īśvara means God, Supreme Being, personal god, or special Self.