Question

the king crowned The Prince as his successor what is the subject of the verb ​

Answer 1

crowned is the subject of the verb

Answer 2

Louis Victor Pierre Raymond de Broglie, duc de Broglie (/dəˈbrɔɪ/; French: [dəbʁɔj][1][2] or [dəbʁœj] (About this soundlisten); 15 August 1892 – 19 March 1987)[3] was a French physicist who made groundbreaking contributions to quantum theory. In his 1924 PhD thesis, he postulated the wave nature of electrons and suggested that all matter has wave properties. This concept is known as the de Broglie hypothesis, an example of wave–particle duality, and forms a central part of the theory of quantum mechanics.

Louis de Broglie