Book of Tang 旧唐书

Once her ambitions were satisfied, she [Empress Wei] allowed herself to be influenced by the perverse words of the imperial secretary Shangguan [Zhaorong]. She introduced Wu Sansi into the inner palace and had him sit on the imperial bed to play shuanglu with her, while the Emperor counted the points for them, finding it a source of amusement and laughter. Word of this scandalous behavior spread further outside day by day.