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Books about Besag:
Ad responsum Florentini de Valentia, das ist, Kurtze Duplic vnnd Defension, auff die Widerantwort, Replic, oder... by F. G Menapius (1618)
Wiki information Besag:
Julian Ernst Besag FRS was a British statistician known chiefly for his work in spatial statistics, and Bayesian inference.
Besagues are circular defences designed to protect the armpits, as part of a harness of plate armour. The armpits are the location of the axillary arteries, and protecting them was therefore vital. Armour without besagues might employ larger shoulder...