The majority of the kingdom inhabitants were Amorites. Originally, Apum was a small city perhaps located in the vicinity of modern-day
Qamishli. The kingdom was attested for the first time in the
Archives of Mari (c. 1774 BC). At the time of its attestation, Apum was already in control of the old capital of Amorite ruler
Shamshi-Adad I,
Shubat-Enlil, which became Apum's capital. In 1771 BC, Apum received a warning from Mari's monarch
Zimri-Lim regarding an
Eshnunnite attack, however, the Apumites were unable to resist and their capital was occupied by the invading force. Afterwards, Apum was overrun by an
Elamite invasion led by a general named
Kunnam, who shared the power with the Apumite king
Haya-Abum, who was a vassal of Mari. and the capital of Apum was invaded by the kingdom of
Andarig. However, it is certain that by 1750 BC, Apum's dynasty was in firm control over its capital, after an alliance with the kingdom of
Kurda that drove the Andarigites out. Apum came to an end after the invasion of the
Babylonian king
Samsu-Iluna in 1728 BC. The 23rd year name of Samsu-Iluna reads: In a letter to Mari (in
Zimri-Lim year 4) it is reported that Turum-Natki, the ruler of Apum had died, and that Qarni-Lim, ruler of
Andarig had installed the son of Turum-Natki in that office. ==Rulers==