Several children and possible children are recorded: While Kashta ruled Nubia from Napata, which is 400 km north of Khartoum, the modern capital of Sudan, he also exercised a strong degree of control over Upper Egypt by managing to install his daughter, Amenirdis I, as the presumptive God's Wife of Amun in Thebes in line to succeed the serving Divine Adoratrice of Amun, Shepenupet I, Osorkon III's daughter.

[9] Török observes that Kashta's appearance as King of Upper and Lower Egypt and peaceful takeover of Upper Egypt is suggested both "by the fact that the descendants of Osorkon III, Takelot III and Rudamun continued to enjoy a high social status in Thebes in the second half of the 8th and in the first half of the 7th century" [BCE] as is shown by their burials in this city as well as the joint activity between the Divine Adoratrice Shepenupet I and the god's Wife of Amun Elect Amenirdis I, Kashta's daughter.

[10] A stela from Kashta's reign has been found in Elephantine (modern day Aswan)--at the local temple dedicated to the god Khnum—which attests to his control of this region.

Some sources credit Kashta as the founder of the 25th dynasty since he was the first Kushite king known to have expanded his kingdom's influence into Upper Egypt.

[13] Under Kashta's reign, the native Kushite population of his kingdom, situated between the third and fourth Cataracts of the Nile, became rapidly 'Egyptianized' and adopted Egyptian traditions, religion and culture.