Incorrect.
The 
Ptolemaic dynasty /ˌtɒləˈmeɪ.ɨk/ (
Ancient Greek: Πτολεμαῖοι, 
Ptolemaioi), sometimes also known as the 
Lagids /ˈlædʒɨdz/ or
Lagidae /ˈlædʒɨˌdiː/ (
Ancient Greek: Λαγίδαι, 
Lagidai, after 
Lagus, Ptolemy I's father), was a 
Macedonian Greek royal family which ruled the 
Ptolemaic Kingdom in 
Egypt during the 
Hellenistic period. 
Their rule lasted for 275 years, from 305 BC to 30 BC. They were the last dynasty of 
ancient Egypt.
Personally, I don't think the ancient Egyptians were Africans. The Egyptians typically painted representations of themselves with light brown skin. They probably looked a lot like this: