Sistine
adjective
Sis·tine ˈsi-ˌstēn 
si-ˈstēn
variants or less commonly Sixtine
ˈsik-ˌstīn
-ˌstēn
1
[from Pope Sixtus IV †1484] : of or relating to the Sistine Chapel in the Vatican
2
: of or relating to any of the popes named Sixtus
Word History
Etymology
Italian sistino, from New Latin sixtinus, from Sixtus, name of some popes
First Known Use
1771, in the meaning defined at sense 2