If real history is of any interest to you, then you may know that Ishmael’s mother was not as slave, but a daughter of the king of Egypt.
In fact, Ishmael, the firstborn son of Abraham, also became a king. He ruled the kingdom of Isin from c.1953 to 1933 BC. From Sumerian archeological excavation he is known as Ishme-Dagan / Icme-Dagan.
Ishmael ruled for 20/18 years, he is known for rebuilding the temple at Ur.
Genesis 25:16 (KJV) lists him as a father of twelve princes.
“16 These are the sons of Ishmael, and these are their names, by their towns, and by their castles; twelve princes according to their nations.”
Because Ishmael's daughter, Basemath, married the firstborn son of Isaac, his descendants became part of the Covenant.
Basemath and Esau had a son (Gen. 36) whose name was Reul, name meaning - Friend of God. One of Reul's grandsons was Job, praised by God as the best of His creation.
“Sumerian civilisation, already on the wane due to the collapse of agriculture and a depopulation of southern Mesopotamia, was ended in circa 2004 BC when Third Dynasty Ur was defeated by Elam.
The Amorites, who had been settling in Mesopotamia for some centuries, effectively became the successors to the Sumerians, assimilating their culture and founding city states of their own; Babylon, Ebla,Hamath, and Isin.
Isin (modern Ishan al-Bahriyat) already existed under the rule of Ur's Third Dynasty, but there are no records of any of its rulers from the Sumerian period. Instead, it achieved independence as Ur declined. One of the final king's officials, Ishbi-Erra, moved to Isin and established himself as a ruler there, continuing many of Ur's traditions and ceremonies.”
After Ishmael’s / Ishme-Dagan’s death, the kingdom of Isin was ruled by his son in law, Esau, known from the king’s list as Lipit-Ishtar / Lipit-Ectar.
Esau, the firstborn son of Isaac (Gen. 25) ruled the kingdom of Isin for 11 years, from c.1933 until 1922 BC, when he was killed by his brother Jacob / Israel. (Book of Jubilee; Testament of Twelve Patriarchs).