Conversation so far:
What type of settlements were there?
There were very few nucleated settlements in Gaelic areas.
What did the buildings look like?
It was at this time, perhaps as a response to Viking raids, that many of the Irish round towers were built.
What material were the buildings made of?
concentrated in counties Limerick and Clare but are lacking in Ulster, except the area around Strangford Lough.
Did the buildings survive?
surrounded by a wall (see bawn) and ancillary buildings.
Gaelic families had begun to build their own tower houses by the 15th century.

Question: What else did they build during this time period?
Self-contained rewrite: What else did the Gaelic Irish build during the 15th century, besides their own tower houses?