Ealdor-apostol

According to the Old English Dictionary:

aldor-apostol, es;

ealdor-apostol

m. The chief apostle, the chief of the apostles; princeps apostōlōrum :-- He mynster getimbrede on áre Sce UNCERTAIN Petres ðæs ealdorapostoles he built a monastery in honour of St. Peter, the chief apostle, Bd. 4, 18; S. 586, 26. ealdor-apostol