One of the most common forms of literature during the Abbasid period was the compilation. These were collections of facts, ideas, instructive stories and poems on a single topic, and covers subjects as diverse as house and garden, women, gate-crashers, blind people, envy, animals and misers. These last three compilations were written by al-Jahiz, the acknowledged master of the form. These collections were important for any "nadim", a companion to a ruler or noble whose role was often involved regaling the ruler with stories and information to entertain or advise.