Premise: This is the oldest Christian site in Dublin St. Patrick himself is reputed to have baptized converts on this spot (marked by a Celtic crosein the nave), suggesting that there has been a church here from around a.d. 450.

Hypothesis: There has been a church on this spot since 450 A.D., when St. Patrick baptized converts here, making it the oldest Christian site in Dublin.
Relation: entailment