The word 'corslet' was adopted as a so-called 'occupational surname,' later altered to Coslett, Cosslett, Coslet, etc., following the arrival of an expert in the manufacture of osmond iron, Corslet Tinkhaus, to Wales from his native Westphalia in 1567.
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Its organization commenced in Almansa in 1634, its force fixed at fifteen companies with 90 harquebusiers, 40 musketeers, and 60 corslets and pikemen each.