In the first two weeks of August there was a great kerfuffle about a BBC educational cartoon which showed a couple in Roman Britain who would be called multiracial in Late Capitalist Britain. Angry essays were typed, tweets flew with the wrath of the Stymphalian Birds, and many people hurried to let the Internet know which faction they aligned with. Neville Morley did a good job of summarizing how most ancient historians think about the problem in his blog post Diversitas et Multicultaralismus (no, a dark-skinned official and his light-skinned wife would not have been unheard of at Bath or Hadrian’s Wall; genetic data is exciting but just one of many kinds of evidence which historians draw upon to understand the past; genes are only loosely connected to identity). The Romans could be horrible snobs and bigots, but most of their stereotypes and slurs were directed at people from other parts of Europe and the Mediterranean … they do not seem to have been very interested in whether people had dark skin and kinky hair. In this post, I would like to talk about one of the methodological questions I have after reading the Wellcome Trust paper from 2015 by Leslie et al. which some people have been citing as evidence that negligible numbers of people from Africa had children in Britain before the 20th century (doi:10.1038/nature14230).