What is the earliest historical instance of state-paid Clergy?

Years ago I read in a book about the days of Constantine and how the early church fathers, who had been ducking the persecutors' swords for so long, were overwhelmed when the Roman State turned benign under Constantine and they began to shower gifts, including Salaries, on the clergy. Church buildings, basilicas, garments, etc. Eusebius in his Ecclesiastical History said something about the elders being dazzled by the wealth of material things. I have google-searched this topic but it is hard to narrow the language properly to find the answer: WHEN, specifically, was the first instance or instances of state-funded Christian ministers? My memory says it was indeed in Constantine's reign but I can find no evidence. Wikipedia on State Religion says "The first state-sponsored Christian church was the Armenian Apostolic Church, established in 301 CE.", but does not define such. I'll try to find its cited source doc. I did find this one source document (image below) that for now would be the earliest instance I van find that refers to “state” monetary support, if the Queen is considered to speak and act for the state. The King here seems to be Khosrov I, and date would be ~252-268ce Christian laity from earliest days, (Acts 2, and even earlier in Jesus's own ministry) supported their elders/leaders with hard goods or other contributions. What I'm asking is different: state-sponsorship via monetary support of the clergy [bishops, priests, etc]. Anyone have a source for this?