Answer:
1095
The first known use of plenary indulgences was in 1095 when Pope Urban II remitted all penance of persons who participated in the crusades and who confessed their sins. Later, the indulgences were also offered to those who couldn't go on the Crusades but offered cash contributions to the effort instead.
Explanation:
Hi. I am not sure if there are choices that should be included in your question. In case there are none, let me go ahead and answer this for you. The activity occurred during the Golden Age of Muslim culture was the major discoveries in mathematics and sciences. The Arab World contributed greatly in the modern science and mathematics.