He was a well-known chef
during the Renaissance and
cooked for six popes.

Bartolomeo Scappi

Explanation:

Bartolomeo Scappi (circa 1500 – 1570) was a Renaissance Italian author and cook. During his career, he cooked for six popes.

i'm not too sure - if you could attach the picture

i believe their role is to instruct certain sections on when they are to join and when they are to stop