Why did Pope Nicholas V work as a tutor for Florentine families?

Pope Nicholas V worked as a tutor for two wealthy, cultured Florentine families primarily to earn money after he was forced to interrupt his studies at the University of Bologna due to a lack of funds.1

Following the death of his father when he was nine years old, Nicholas—then known by his family name, Parentucelli—faced financial hardship. His two-year tenure as a tutor provided the necessary income to complete his education. This period was significant in his life, as his close contact with the early Renaissance culture of Florence deeply influenced his later career as a patron of the arts and scholars, as well as his role as the founder of the Vatican Library.1