Without the slightest doubt, the Great Disciple of the Buddha whom I most revere is:Ananda ~ Guardian of the Dhamma
1. Ananda's Personal Path
2. Ananda's Renown
3. Ananda as the Buddha's Attendant
4. Ananda as the Guardian of the Dhamma
5. Ananda's Attitude Toward Women
6. Ananda and His Fellow Monks
7. Ananda's Conversations with the Buddha
8. Ananda's Former Lives
9. The Last Days of Gotama the Buddha
10. After the Death of the Buddha82,000 Teachings from the Buddha
I have received;
2,000 more from his disciples;
Now, 84,000 are familiar to me.
Who nothing has heard and nothing understood,
He ages only oxen-like:
His stomach only grows and grows,
But his insight deepens not.
Who has much heard and learned,
But does despise him who is poor in learning,
Is like one blind who holds a lamp.
So must I think of such a one.
Thou follow him who has heard much,
Then what is heard shall not decline.
This is the tap-root of the holy life;
Hence a Dhamma-guardian  thou should'st be!
Knowing what comes first and last,
Knowing well the meaning, too,
Skilful in grammar and in other items,
The well-grasped meaning he examines.
Keen in his patient application,
He strives to weigh the meaning well.
At the right time he makes his effort,
And inwardly collects his mind.— the Venerable Ananda,
in Thag 17.3 (vv. 1024-29)
The one disciple of the Buddha most often mentioned in his discourses is Ananda. Amongst all those great monks around the Buddha he occupies a unique position, and this in many respects, as will be mentioned in these pages.http://www.accesstoinsight.org/lib/auth ... el273.html
We have the Suttas and the Bhikkhuni Sangha due to this wonderful, diligent, compassionate person.