From: On the Life of St. Patrick, Author: unknown[1]
From: THE CONFESSION OF ST. PATRICK. THE BEGINNING OF THE BOOKS OF THE BISHOP ST. PATRICK.
"I, Patrick, a sinner, the rudest and least of all the faithful, and most contemptible to very many, had for my father Calpornius, a deacon, the son of Potitus, a priest, who lived in Bannaven Taberniae, for he had a small country-house close by, where I was taken captive when I was nearly sixteen years of age." Unfortunately this work is not dated nor are any dates given for any of the events in it. According to Wikipedia, "Saint Patrick (Latin: Patricius; Irish: Pádraig [ˈpˠaːd̪ˠɾˠəɟ]; Welsh: Padrig) was a fifth-century Romano-British Christian missionary and bishop in Ireland. Known as the "Apostle of Ireland", he is the primary patron saint of Ireland, along with saints Brigit of Kildare and Columba. He is also venerated in the Anglican Communion, the Old Catholic Church and in the Eastern Orthodox Church as equal-to-the-apostles and Enlightener of Ireland...The dates of Patrick's life cannot be fixed with certainty, but there is broad agreement that he was active as a missionary in Ireland during the second half of the 5th century. Early medieval tradition credits him with being the first bishop of Armagh and Primate of Ireland"
http://www.catholic-saints.info/patron-saints/saint-patrick.htm estimate his birth in 387 and death in 464. This later than the dates indicated in the The Project Gutenberg eBook, The Most Ancient Lives of Saint Patrick, by Various, Edited by James O'Leary which estimate his birth in 376 and death in 458. In either case the birth year for his father could not be 0295 as originally shown here. There appears to be agreement that St Patrick was born in the later half of the 4th century so after 350. This would put his father's birth as probably after 320.
Calpurnius ap /Heireann/ Page: Database online. Data: Text: Record for Tigridia Ireland - Record for Calpurnius Calpurnius
The use of the patronymic "ap" is anachronistic for persons living in the 4th century AD. Most likely, Calpurnius was Romano-British or even from a Continental family (his wife Conchessa certainly was), so it's probable that he was a native speaker of Vulgar Latin.
"Heireann" as the surname seems to be an attempt to use the mutated Irish genitive hÉireann as a surname, which is not correct. The genitive of Éire (Ireland) in Modern Irish is actually Éireann. hÉireann only occurs with h-prothesis, often after the genitive definite article na, which is sometimes used in this expression, so na hÉireann or Éireann' would be, at least in some sense, correct, but "heireann" by itself doesn't make much sense. Of course, ap is Welsh, so "Calpurnius ap Heireann" is a weird ungrammatical, anachronistic mishmash of three different languages.
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Spouse: Conchessa Succat ... Birth: 295 - Cork, Ireland ... Death: Pyrenees-Atlantiques, Aquitaine, France