ktetor
One who funds the building or reconstruction of an Eastern Orthodox church or monastery.
Sava drew upon the monastery’s typikon (rule or charter), which was his privilege as ktitor (founder) of the institution.
Where it comes from
From Ancient Greek κτήτωρ (ktḗtōr). The alternative form ktitor likely came via a Slavic intermediary such as Macedonian ктитор (ktitor) or Serbo-Croatian ktitor.
Adapted from the Wiktionary entry ktetor (CC BY-SA 4.0).