Margaret, An excellent and modern introduction, and in English, is AR Disney, A History of Portugal and the Portuguese Empire, (Two volumes: Cambridge, New York, 2009)
Unfortunately from the point of view of providing additional Portuguese perspectives, in relation to providing insights into Lannes’ sojourns in Lisbon, Disney refers in the main to your article on this site – but also makes reference to Sibert, and the most recent work I referred to Serrăo, História de Portugal, vol. 6 – which is a meticulous if conservative (with a small c) history
Best
A