What are some of the best historic autobiography’s?

If you're looking for certain "landmark" works in the history of biography, check out The Book of Margery Kempe, which is often considered to be the first autobiography in the English language. It was transcribed by her priest at the turn of the fifteenth century, and although Kempe was disregarded as something of an eccentric until recently, it's generally seen as a must-read for anyone interested in the development of autobiography as a form. Whether or not you'll find it worthwhile though probably depends on you own interests; it's predominantly a spiritual biography, chronicling her pilgrimages and mystical religious experiences, but it also offers some fascinating insight into medieval domestic life and, more broadly, the experience of simply being a woman during that period.

Alternatively you could go further back and pick up a translation of Augustine's Confessions (the Sheed version is the best and stunningly poetic). Again, the focus is spiritual and it's not really what we would call a typical "autobiography" today, but Augustine is generally seen to represent an important self-reflective development in Western literature and thought. The Confessions is one of the earliest texts we have that exhibits a sensitive and fairly conscious turn toward the interiority, a focus on inner feeling and thought, that tends to characterise autobiography in succeeding centuries right through to today.

So just a couple of suggestions to get you started. Autobiography: A Very Short Introduction by Laura Marcus is also a fairly accessible starting point for more scholarly considerations of the form if you're interested in that sort of thing, too.