According to the lecture on the renaissance, what ancient greek philosophy was the underpinning of the italian renaissance?

The Italian Renaissance  was the earliest manifestation of the general European Renaissance, a period of great cultural change and achievement that began in Italy during the 14th century and lasted until the 16th century, marking the transition between Medieval and Early Modern Europe. The term Renaissance is in essence a modern one that came into currency in the 19th century, in the work of historians such as Jules Michelet and Jacob Burckhardt.