consto

Consto, constare, constiti, first conjugation, a compound of sto. Three jobs, and it pays to keep them apart. Literally it means to stand firm or hold together, so ratio non constat is "the account does not add up". With ex plus the ablative it means to consist of. And the impersonal third singular constat, "it is established, it is agreed", is by a wide margin what this corpus does with it, taking an accusative and infinitive: constat regem venisse.

There is a fourth use classical prose is fond of: with a price in the ablative, constare means to cost. That branch produced Italian costare, French coûter and English cost. The participial branch gives constant and constancy, both keeping the sense of something that stays put.