How was Cthulhu created?

Cthulhu is characterized as the priest or leader of the Old Ones, a species that came to Earth from the stars before human life arose. The Old Ones went dormant, and their city slipped under Earth’s crust beneath the Pacific Ocean.

Who started Cthulhu?

Cthulhu is a fictional cosmic entity created by writer H. P. Lovecraft. It was first introduced in his short story “The Call of Cthulhu”, published by the American pulp magazine Weird Tales in 1928.