There are about 3 dozen Doctors of the Church and all of them are saints. You need to be more specific.
Saint Leo the Great was declared a Doctor of the Church by Pope Benedict XIV in 1754.
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.
Tertullian is recognized as a Church Father for his contributions to early Christian theology. He is not formally recognized as a saint or doctor of the Church in Catholic tradition.
No.
Doctor of the Church
If you are referring to Pope Saint Leo I, he is a Doctor of the Church but not a patron saint.
He was declared a Doctor of the Church in 1298 by Pope Boniface VIII.
Saint Anthony of Padua.
No
Doctor of the Church
Saint Francis of Assisi is neither a Doctor of the Church nor a Father of the Church. He is known for founding the Franciscan Order and for his dedication to poverty, peace, and caring for creation.