In 726 ce emperor leo carried out an important act which completes the timeline above what symbolic act did he carry out?

Announces he is against icons.

Explanation:

Leo III was a Byzantine Emperor who founded the Isaurian dynasty. One of his most important contributions was the prohibition of the veneration of icons. Leo III issued a series of edicts in 726 CE in which he argued against the veneration of images (icons). This prohibition was not welcome by the population, and in fact, it was strongly opposed with hostility, causing deep divisions among the population.

c-three

explanation:

legislative, executive and judicial

c) troops march forward in close formation against newer, more accurate weapons