Peter's mother was expelled while pregnant from the Samuel's court before the accession of Gavril Radomir, but given Delyan's subsequent career, it is likely that he had been born and remained in Bulgaria with his father.
Ibunda Petŭr diusir saat hamil dari istana Samuil sebelum aksesi Gavril Radomir, tetapi mengingat karier Delyan berikutnya, kemungkinan dia telah lahir dan tinggal di Bulgaria bersama ayahandanya.