School: St Pappan's, Ballymun
- Location:
- Ballymun, Co. Dublin
- Teacher: M. O' Riordan

Archival Reference
The Schools’ Collection, Volume 0792, Page 277
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- The Mound of Knocksedan
The Mound of Knocksedan is situated on the main road to Naul about five miles from Ballymun. It lies to the right hand side of the fort. It is fairly high. The little river Pill flows to the east of the fort and meets the sea at Malahide. Every Hallow Eve a fairy boat comes sailing down the river. The fairies disembark go up on to the mound and dance there all night. The local people pronounce this word Knock-shee-dan perhaps on account of the story about the fairies.
There are the ruins of some old buildings on the opposite side of the road. People say that it was a nun’s monastery long ago. There is a tunnel in the mound leading to Malahide and during the troubled times in Ireland the(continues on next page)- Informant
- John Fields
- Relation
- Parent
- Gender
- Male
- Address
- Coultry, Co. Dublin