Ananda, Guardian of the Dharma
Ananda was a first cousin of Gautama Buddha and is one of the ten principal disciples of the Buddha. It is believed that Ananda had the most retentive memory. Since the sutras of Sutta Pitaka that was shared during the First Buddhist council was from his recollection of the teaching of Buddha. Hence due to this reason, Ananda was considered as the Guardian of the Dharma.
As mentioned in the Buddhist tradition, every Buddha has two chief disciples along with one attendant. In case of Gautama Buddha, his chief disciples were Sariputta and Maudgalyayanaand his attendant was Ananda.