I was trained as a philosopher never to put philosophers and their ideas into historical contexts, since historical context has nothing to do with the validity of the philosopher's positions. I agree that assessing validity and contextualizing historically are two entirely distinct matters and not to be confused with one another. And yet that firm distinction doesn't lead me to endorse the usual way in which history of philosophy is presented.

Plato at the Googleplex: Why Philosophy Won't Go Away (ed. Atlantic Books Ltd, 2014) - ISBN: 9781782395584