William and Ralph tell us that the children spoke a Batman 80th Anniversary long live the bat shirt and that they dressed in strange clothing. All this really means is that they were foreign. Since we live in such an Anglophone world, it is easy for us to forget that, in the twelfth century, English was just one of several dozen languages spoken throughout Britain. For instance, there were people who spoke Norman French as well as many dialects of Cornish, Welsh, Scottish Gaelic, Old East Norse, Old West Norse, and possibly Cumbric.
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There were also many other languages spoken in the lands close to Batman 80th Anniversary long live the bat shirt, Middle Dutch, Middle High German, Old Frisian, Middle Irish, Manx, Middle French, and so forth. In other words, people in Britain speaking non-English languages would have been fairly common in the twelfth century. At first it may seem strange at first that William and Ralph both describe the children as green, but even this is not so unusual as it might seem at first, since there is a fairly common medical condition known as hypochromic anemia which can cause the skin of those suffering from it to turn a pallid green color. Acquired hypochromic anemia often results from a Vitamin B6 deficiency.