Patrick was a monk of the early Celtic church tradition, before the Roman church took over. The Roman priest Palladius landed in Ireland before Patrick.
The Anabaptist tradition which subsequently led to the Baptist church started in the year 1521.
Quote; ""There is strong evidence that Patrick had no Roman commission in Ireland...As Patrick's churches in Ireland, like their brethren in Britain, repudiated the supremacy of the popes, all knowledge of the conversion of Ireland through his ministry must be suppressed [by Rome]....There is not a written word from one of them [i.e., popes] rejoicing over Patrick's additions to their church, showing clearly that he was not a Roman missionary....Prosper does not notice Patrick....He says nothing of the greatest success ever given to a missionary of Christ, apparently because he [Patrick] was not a Romanist....Bede never speaks of St. Patrick in his celebrated 'Ecclesiastical History.'...So completely buried was Patrick and his work by popes and other Roman Catholics, that in their epistles and larger publications, his name does not once occur in one of them until A. D. 634." (William Cathcart, D. D., The Ancient British and Irish Churches, pp.83-85)" http://www.truthontheweb.org/patrick.htm