Simplify the following text for a Grade 8 native English-speaking person.
Original: Publius Aelius Hadrianus ( 24 January 76 â `` 10 July 138 ) , commonly known as Hadrian and after his apotheosis Divus Hadrianus , was Roman Emperor from 117 to 138 .
Simplified: Hadrian ( Publius Aelius Hadrianus , 24 January 76 â `` 10 July 138 ) was Roman Emperor from 117 to 138 .