The office, position, or authority held by an archtreasurer.
From 'archtreasurer' plus the suffix '-ship' (from Old English '-scipe', denoting office, condition, or state). This noun form formalizes the administrative position into an institutional role.
The '-ship' suffix is like adding 'CEO position' to any job—it makes it sound official and important. By the medieval period, people were using '-ship' to create fancy titles for every imaginable role!
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