In Jerusalem around 600BC, who was Laban?

The Book of Mormon speaks of an influential person in Jerusalem named Laban who was the keeper of the record of the Jews, and had power to command at least 50 men (see 1 Nephi 3:31 ). > "Laban hath the record of the Jews and also a genealogy of my > forefathers, and they are engraven upon plates of brass." (1 Nephi 3:1-27 ) We know Laban was a man of some degree of power and influence in Jerusalem, that he had servants, and a treasury, and kept the genealogy of the Jews in his treasury, but it apparently wasn't beneath him to go out and get black-out drunk in the streets (see 1 Nephi 4:7-8 ). Who was Laban? What position did he hold in Jewish society?