Liber Expugnationis Regionum, also known as Kitab Futuh al-Buldan (فتوح البلدان), or Book of the Conquests of Lands is a condensed version of a longer history. It describes the wars and conquests of the Arabs from the 7th century, and is considered chief among Al Biladuri's surviving works. This is a second edition, edited and with an introduction (in Latin) by the famous Dutch orientalist M.J. de Goeje. The text of the book is in Arabic.

AHMAD BIN YAHYA BIN JABIR AL BILADURI (d. 892) was a Persian historian from the Ninth Century, considered today as a reliable source of early Arabic and Islamic history, particularly of the Muslim expansion. He lived at the court of the caliphs Al-Mutawakkil and Al-Musta'in in Baghdad, and served as tutor to al-Mutazz's son. He died in 892 from an overdose of the drug baladhur (from which Al Biladuri's name is derived).