The most important thing that Abraham did was making a promise/agreement with God. He later became a god of his own. He also got the "Promise land" from God. He was admired by many Jewish people and still is today.
When & Where
Abraham had a very great lifetime. He lived in the west of India and his date of birth is unknown. Along his journey, He made a convent with God and God gave him the promise lands. He then lived there for the rest of his days.
Abraham is important to history because he made up an religion. He was the founder of Judaism and is an important character to religious people. Because of this we now have the religion of Judaism.