It seems that both s’s and s’ could be valid here, according to Merriam Webster
https://www.merriam-webster.com/grammar/what-happens-to-names-when-we-make-them-plural-or-possessive
It’s an ex belonging to one Cyrus.
It seems that both s’s and s’ could be valid here, according to Merriam Webster
https://www.merriam-webster.com/grammar/what-happens-to-names-when-we-make-them-plural-or-possessive
It’s an ex belonging to one Cyrus.
Campi?