I'm currently reading one of the few available biographies of him, the old A. P. Hill, Lee's Forgotten General by Warren Woods Hassler and have just today read the section on and following Chancellorsville and the creation of the Third Corps. Lee's correspondence recommending it and Hill to command was quoted in full and was largely as stated by ole and rpkennedy. Hassler also put forth the theory about Hill's choice of the name of his Light Division stated by 20thncarolina. However, following the creation of the Third Corps, the division, now commanded by William Dorsey Pender, was no longer the largest because two of its brigades were stripped off and combined with two others to create a new division led by Henry Heth. There was something of a problem because R. E. Lee had only "imported" Heth from the Western Theater to lead one of Hill's brigades in the days prior to Chancellorsville, making him the senior brigadier. Hill felt that was unfair to Pender, who he knew and preferred to succeed him as commander of the Light Division, so recommended the above resolution to Lee who approved it. Hill's third division was acquired by transferring Richard H. Anderson and his brigades from Longstreet's Corps, thereby making Anderson the senior division commander in Hill's Third Corps.