What event was considered the beginning of the Reconquista?

The reconquista began immediately after the Arabs completely conquered the Iberian Peninsula. It happened at the very beginning of the eighth century. Soon, in the very north, in the mountainous regions, organized resistance began, including vassal princes and small feudal lords, who gradually refused to obey the Muslim rulers. It is believed that the first year of the Reconquista was 722. Although the first battle took place at Covadong in 718. Now this is the north of Asturias.