Justin Swanstrom wrote : "It's hard to escape the problem that the earliest evidence of the Manx coat of arms dates from the period after thHe Norse rulers."
Is this a problem ? In an historical analysis it would rather become evidence of origin for the noble man who is using the triskelion in Norway ? I wonder where this misunderstanding has originated ?
In the years 1265 to 1275 the Norwegian nobility remained at Isle of Man together with the norwegian bishop who were named by the archbishop of Nidaros (Trondheim). This was according to the treaty between the king of Norway and the Scottish king in 1266, wich is preserved and an open source for anyone who bothers to study it. The treaty granted the Norwegian nobles security for life and property under the Scottish king.
After the rebellion in 1275 in wich the norwegians participated against the Scottish king, the norwegian nobles left the Isle of man, but the rule of the norwegian bishops at Isle of Man named by the archbishop in Nidaros continued well into the 14th Century
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This sociopolitical frame on Isle of man is very scimilar to that of Jämtland at the same period, where the archbishop of Uppsala named the bishop in Jämtland under the Norwegian kings.
At this time there must have been uncertanity with regards to the future reign on Isle of Man. The treaty of 1266 involves an amount of money as payment and yearly lease to the Norwegian king. It is evidence that this was not paid for by the Scottish king. A situation could arise on a dispute if the treaty was not honoured.
In my opinion the Norwegian nobilitys use of the name Skanke (Shanks) (Torlack Sckenk, first used in 1295) corresponds to the newly established coat of arms at Isle of man in the last third of the thirteenth century. Their interest would be to take positions if Isle og Man should come under Norwegian rule again.
In my opinion the arguments I have seen so far against this connection between Isle of Man and Torlack Sckenk are not of the same weight.