Portavo, Donaghadee, County Down

Bence-Jones, Mark. A Guide to Irish Country Houses (originally published as Burke’s Guide to Country Houses volume 1 Ireland by Burke’s Peerage Ltd. 1978); Revised edition 1988 Constable and Company Ltd, London. 

p. 233. “(Ker/IFR) A house extensively altered in the early yers of C19 by David Ker, who bought Montalto from Earl of Moira. Burnt 1844, rebuilt 1880.