The most rigid or fanatical person devoted to a particular dogma or set of unchanging beliefs.
From 'arch-' (supreme, chief) and 'dogmatist' (one devoted to dogma), from Greek 'dogma' (opinion or principle). This term appeared in 18th-19th century philosophy to describe thinkers stubbornly committed to ideological positions.
Enlightenment philosophers used 'archdogmatist' as a critique—by adding 'arch-' they suggested someone wasn't just dogmatic but had elevated inflexibility into a supreme principle, which was meant as savage intellectual insult.
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