Title: Ishme-Dagan
Content:  Ishme-Dagan (, Diš-me-Dda-gan, Išme-Dagān; fl. c. 1889 BC — c. 1871 BC by the short chronology of the ancient near east) was the 4th king of the First Dynasty of Isin, according to the "Sumerian King List" (SKL). Also according to the SKL: he was both the son and successor of Iddin-Dagān. Lipit-Ištar then succeeded Išme-Dagān. Išme-Dagān was one of the kings to restore the Ekur.
Title: Ishme-Dagan I
Content:  Ishme-Dagan I (fl. c. 1776 BCE — c. 1736 BCE) was a monarch of the Old Assyrian Empire. The much later Assyrian King List (AKL) credits Ishme-Dagan I with a reign of forty years; however, it is now known from a limmu-list of eponyms unearthed at Kanesh in 2003 that his reign in Assur lasted eleven years. According to the AKL, Ishme-Dagan I was the son and successor of Shamshi-Adad I. Also according to the AKL, Ishme-Dagan I was succeeded by his son Mut-Ashkur.
Title: Ishme-Dagan I
Content:   Ishme-Dagan I's father, Shamshi-Adad I, was an Amorite king, originally of Terqa (in Syria), who seized control of Assyria around 1808 BCE. Shamshi-Adad I ruled from the capital city of the Old Assyrian Empire: Shubat-Enlil. Shamshi-Adad I placed his oldest son (Ishme-Dagan I) on the throne of Ekallatum. Shamshi-Adad I placed his youngest son (Yasmah-Adad) on the throne of Mari. Ishme-Dagan I ruled the south-eastern region in Upper Mesopotamia. Ishme-Dagan I's realm of influence included the city-state of Assur.
Title: Ishme-Dagan II
Content:  Ishme-Dagan II or Išme-Dagān II, inscribed miš-me dda-gan and meaning “(the god) Dagan has heard,” was a rather obscure ruler of Assyria, sometime during the first half of the 16th century BC in the midst of a dark age (Edzard's "dunkles Zeitalter"), succeeding his father, Shamshi-Adad II, and in turn succeeded by Shamshi-Adad III from whose reign extant contemporary inscriptions resume. According to the Assyrian Kinglist, he reigned sixteen years.
Title: Ishme-Dagan I
Content:  Ishme-Dagan I's main challenge was in keeping his enemies in check. To Ishme-Dagan I's south was the King Dadusha of Eshnunna (fl. c. 1800 BCE — c. 1779 BCE.) To Ishme-Dagan I's east were the warlike, nomadic, pastoral peoples inhabiting the foothills of the Zagros mountains. Eshnunna was to be Ishme-Dagan I's chief enemy, and although records are sparse, there are some accounts of some political conflicts involving Eshnunna. An instance of defeat occurs in a year-name coined by the King Dadusha of Eshnunna which commemorates a victory over an army led by Ishme-Dagan I.
Title: Ishme-Dagan I
Content:  Although his father counted Ishme-Dagan I as politically astute and a capable soldier, commending him as he berated Yasmah-Adad in their letters, Ishme-Dagan I was not able to hold his father's empire for long after his father died. Ishme-Dagan I eventually lost most of his domain, and was reduced to holding Ashur and Ekallatum, despite waging several counter offensives to try to regain the upper Khabur area. The year-name of the fifth year of Ibalpiel II's reign (indicating some reverence to Shamshi-Adad I at his passing) suggests that Eshnunna had become subservient to the Old Assyrian Empire. Ishme-Dagan I wrote a letter to his brother, after Ishme-Dagan I assumes their father's throne and the rule of all of Upper Mesopotamia, that he: His confidence was overstated, however; as year-names of the eighth and ninth years of King Ibalpiel's reign indicate Eshnunna attacked and destroyed the armies 
Title: Old Assyrian Empire
Content:  various building projects throughout the kingdom. Ishme-Dagan II (c. 1526 BC – c. 1510 BC), son and successor of Shamshi-Adad II, was a rather obscure ruler of Assyria in the midst of a Dark Age. He is only known from the Assyrian King List. The relationship with his successor is uncertain as the copies describe Shamshi-Adad III's father as Ishme-Dagan II, the brother of Sharma-Adad II, who was in turn the son of Shu-Ninua. This Ishme-Dagan, however, has his filiation clearly given as son of Shamshi-Adad II. This led Yamada to suggest that Shamshi-Adad III's father was a different homonymous individual 
Title: Ishme-Dagan I
Content:  A number of letters relating the familial relationships between Shamshi-Adad I and his two sons have been excavated, and these letters provide a glimpse into the tensions of this family of rulers. Ishme-Dagan I is called, “A forceful soldier not afraid to risk his own skin.” This was a quality which allowed Shamshi-Adad I to rely on him unhesitatingly. Shamshi-Adad I's correspondence with his younger son is not as generous, and Ishme-Dagan I appears to have picked up his father's censure of his younger brother and contributed to it. In one letter, Ishme-Dagan I asks his brother, “Why are you setting up a wail about this thing? That is not great conduct.” In another letter, Ishme-Dagan I bluntly commands Yasmah-Adad to, “Show some sense.” In a third, Ishme-Dagan I tells his brother to stop writing their father directly, and use him as an intermediary.
Title: Old Assyrian Empire
Content:  including the city-state Assur. Ishme-Dagan I's main challenge was in keeping his enemies in check; to his east were the foothills of the Zagros Mountains, inhabited by warlike pastoral peoples, and to the south was the Mesopotamian kingdom of Eshnunna. Although his father counted Ishme-Dagan I as politically astute and a capable soldier, commending him as he berated Yasmah-Adad in their letters, Ishme-Dagan I was not able to hold his father's empire for long after his father died. Ishme-Dagan I eventually lost most of his domain, and was reduced to holding Assur and Ekallatum, despite waging several counter offensives to try to regain the upper Khabur area.
Title: Dynasty of Isin
Content:  Ishme-Dagan (fl. c. 1879—1859 BCE by the short chronology) was the 4th king of the Dynasty of Isin, according to the SKL. Also according to the SKL: he was both the son and successor of Iddin-Dagān. Lipit-Ištar then succeeded Išme-Dagān. Išme-Dagān was one of the kings to restore the Ekur.

Question: Who is the father of Ishme-Dagan I?
Answer: Shamshi-Adad I.
Shamshi Adad I.