Why is Descartes Latinised as Cartesius?

1. Why is Cartesian not Descartes?
2. What is the origin of the term Cartesian?
3. Did Descartes write in Latin?
4. What is the Cartesian policy of belief?

Why is Cartesian not Descartes?

A Cartesian coordinate system is named after René Descartes. But Descartes did not first invent the Cartesian coordinate system nor did he first establish analytic geometry on the ground of the Cartesian coordinate system.

What is the origin of the term Cartesian?

Cartesian (adj.)

pertaining to the works or ideas of French philosopher and mathematician René Descartes (1596-1650), 1650s, from Cartesius, the Latinized form of his surname (regarded as Des Cartes) + -ian.

Did Descartes write in Latin?

Descartes epitomises the dilemma faced by many intellectuals: he wrote his most celebrated philosophical works in Latin, yet he authorised and reviewed their French translations,just as he had done with the Latin translation of the Discourse on Method.

What is the Cartesian policy of belief?

Every time a being has the thought that it exists, that belief must be true, even if the being is deceived about everything else. Descartes is right about this. The very act of Descartes believing "I exist" guarantees that it is true, because the act of believing requires there to be a thing doing the believing.