умиротвори́ться (Russian) comes from Russian твори́ться, from Russian -ся, from Old East Slavic сѧ, from Proto-Slavic sę, from Proto-Balto-Slavic *sen, from Proto-Indo-European swé — self.
умиротвори́ться (Russian): to make peace, to end hostilities
Definitions
to make peace, to end hostilities
Ancestry of “умиротвори́ться”, step by step
умиротвори́ться traces back through two separate lines of ancestry.