Margaret Stevens

Margaret you are in the right place, according to the Townlands website Clifferna is a townland in Larah and Knockataggert is a subtownland, so does not appear as a townland, it is south east of Stradone, civil parishs do not always match the relgious divide for the catholic church, also townlands we sometimes moved by the bishop from one parish to an adjoining depending on population and income for that parish. Knockataggert is Hill of the Priest, you can see the townland here https://www.townlands.ie/cavan/tullygarvey/larah/larah-south/clifferna/ and you can see the parish outlines here https://registers.nli.ie/

Stradone is an electoral district but not a parish. All maps including old ones can be viewed here https://www.osi.ie/

Good Luck

Pat