Some of them- but not all Ravkan Saints were. Most of them were Grisha, who aren't really immortal but they do live so much longer than otkazat'sya.

[She knows that takes some explaining, so she continues: ]

Grisha are people in my world blessed by the Saints with powers, perhaps similar the way we receive gifts from Singularity here. Except that Grisha aren't as common as the abilities we get here.

Not all Grisha are Saints, but all Saints do seem to be Grisha, based on their individual legends.