Yang Zhi had been assigned to the Northern Capital as security aide to Grand Secretary Liang, son-in-law of Grand Tutor Cai Jing. With the approach of the Grand Tutor's birthday on the 15th day of the 6th month, Liang bought an extremely expensive gift and arranged for Yang to deliver it, under military convoy, to Cai's residence in the Eastern Capital.
楊志被編配到北京大名府，得留守梁中書收為心腹。這梁中書是當朝太師蔡京的女婿，因太師六月十五日生辰，買了價值萬貫的壽禮，要楊志押解生辰綱（綱即貨物運輸隊）上京祝壽。