Vicar general
Returned to Transylvania, he became the vicar of the bishop of Făgăraş Inocenţiu Micu-Klein. When in 1744 Micu-Klein, because of his petitions for freedom for all Romanians, was exiled in Rome, in a short time Aron remained as the reference figure in the Church. He actually was appointed Vicar general of the diocese of Fagaras on 31 August 1745.