Song Jing
Around the new year 717, Su, whose title had been changed to "Ziwei Shilang" (紫微侍郎) by that point due to a number of name changes in offices that Emperor Xuanzong instituted, was given the designation "Tong Ziwei Huangmen Pingzhangshi" (同紫微黃門平章事), making him a chancellor "de facto". He worked well with the more senior chancellor Song Jing. It was said that Song was strict and often made the decisions that Su obeyed. Whenever Song made reports to Emperor Xuanzong, Su would make reports that supplemented Song's. Song once commented: