Ipse dixit

Rarity: Common

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What Wikipedia says

Ipse dixit (Latin for "he said it himself") is an assertion without proof, or a dogmatic expression of opinion.

Excerpt from the Wikipedia article “Ipse dixit”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Visconti - Iconograph rom. pl. 12 N. 1 (Abb. 428) (Publisher K. A. Baumeister), Public domain, via Wikimedia Commons.