TIR-IVAN (TIR-IEUAN), a township, in that part of the parish of YSPYTTY-IVAN which is in the hundred of ISALED, union of LLANRWST, county of DENBIGH, NORTH WALES, 2 miles (S. S. W.) from Pentre-Voelas; containing 268 inhabitants. It is situated near the source of the river Conway, on the borders of Carnarvonshire and Merionethshire, where the mountains form elevated and extensive wastes, from which descend numerous streams. The name signifies the ground or territory of leuan, and is de-Tired from the circumstance of the Knights of St. John of Jerusalem having, had an Hospitium here. The rateable annual value is returned at £612.