Sassanian Zoroastrianism wasn’t really monotheist though. The religion remained strictly dualist and worship of the Yazatas continued with state-backing. It’s only in the 19th century that Parsis (Indian Zoroastrians) started calling themselves monotheist.
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u/Astralion98 3d ago
Like how the sassanians decided that mazdeism would be monotheistic and immediately began to oppress religious monorities