Tertullian was born in 155.
Tertullian was a great Christian martyred for his faith. He said "The blood of the martyrs is the seed of the church"
If you are referring to Pope Saint Leo I, he is a Doctor of the Church but not a patron saint.
Saint Leo the Great was declared a Doctor of the Church by Pope Benedict XIV in 1754.
Tertullian
No.
No, St. Paul is not a Doctor of the Church.
No, she is not a Doctor of the Church. She is not a saint yet.
Saint Anthony of Padua.
Doctor of the Church
Pope St. Leo I, the Great, is a Doctor of the Church but not considered a patron saint.
Luke was a doctor(Colossians 4:14)