Buto was an ancient city in the Nile Delta of Egypt that was 95 km or 59 miles east of Alexandria. Originally there were two cities called Pe and Dep which merged into one which the Egyptians called Per-Wadjet. Wadjet was a local goddess represented by a cobra and was the patron diety of Lower Egypt. The city was the primary site of cultural development for nearly ten thousand years until 3100 BC. It lost its standing after the unification of Lower and Upper Egypt. The name was changed to Buto when they were under Greek rule from 305 to 30 BC. Buto was the Greek name for the same goddess Wadjet.
Ancient Egypt page