"Predisponent" Natural Recordings by Native Speakers
Predisponent is not a word in English language. However, I think you might be referring to "predisponent" which is Italian and means "one who precedes" or "a predecessor".
In English, the word you might be looking for is "predisponent" may be connected to the word "predispose" which means to influence or predisposition.
However, a more likely word is "disponent" which is an adjective that means "one who has control or authority over; a manger or overseer".