Bartholomew the Younger was an Italo-Greek monk and abbot who lived from approximately 970 to 1055. Born in Rossano, he became a close disciple of Nilus the Younger, the founder of the monastery at Grottaferrata. Following his teacher, Bartholomew served as the third successor to the abbacy. During his forty-year leadership, he oversaw the completion of the abbey and is credited as its second founder, establishing the structural foundation that allowed the monastery to endure into the modern era.