Word

践祚

せんそ
accession (to the throne)
Word

永祚

えいそ
Eiso era (989.8.8-990.11.7)
Word

重祚

じゅうそ、ちょうそ
second accession to the throne
Word

皇祚

こうそ
rank of emperor; the imperial throne
Word

宝祚

ほうそ
rank of the emperor; the imperial throne