Gildas - English translation of his works, by J.A. Giles. In PDF. 288K. - http://www.yorku.ca/inpar/gildas_giles.pdf
Works - Modern English translation of Gildas's history of Britain. From the Internet Medieval Sourcebook. - http://www.fordham.edu/halsall/basis/gildas-full.html
On the Ruin of Britain - Historical work. J.A. Giles translation. In graphical browsers, this is the online equivalent of a "large print" edition. - http://www.worldwideschool.org/library/books/lit/historical/OntheRuinofBritain/toc.html