Simplify the following text for a Grade 9 native English-speaking person.
Original: In the 6th century , gorgoneia of a canonical `` lion mask type '' were ubiquitous on Greek temples , especially in and around Corinth .
Simplified: In the 6th century BC , gorgoneia of a basic type of `` lion mask '' were found all over Greek temples , especially in and around Corinth .