Antoninus Pius, of Rome

His reign was 20+ years of uninterrupted peace, he was loyal to his wife who he remained faithful to. He expanded rights for slaves, he founded charities and chose peace over war.

The Jews who were just recently butchered by his predecessor Hadrian were so thankful for his cancellation of Hadrian’s anti-Jewish laws that he’s the only Roman Emperor written positively by Judaism, his reign lasted from 138 AD to 161 AD.

(Also regarded as Rome's nicest Emperor)