I did not mean to delete that post. I had a mouse spasm!
Tertullian in his later years became attracted to the schismatic sect of Montanism, and some of his later writings reflect this (even though he continued to vigorously oppose the gnostic heresies). While he may not have ever left the Church or been excommunicated, it was enough to throw doubt on his orthodoxy at the end of his life and he’s never been revered as a saint. Note that this isn’t a judgment saying that he’s in hell. We don’t know. He may have needed extensive cleaning in Purgatory perhaps. He may be in heaven and we just don’t know it. Even so, his orthodox writings are still referenced extensively.