《后汉书·列传·光武十王列传》
永平元年，刘强生病，显宗派中常侍钅旬盾令将太医乘驿车去看病，诏沛王刘辅、济南王刘康、淮阳王刘延等到鲁。
永平元年，彊病，显宗遣中常侍钩盾令将太医乘驿视疾，诏沛王辅、济南王康、淮阳王延诣鲁。
In the first year of Yongping, Liu Qiang fell ill, and Emperor Xianzong sent the middle chamberlain Ci Xundunling to order the imperial physicians to use the imperial relay system to travel to treat his illness; he also summoned King Pei of Lu, King Kang of Jinan and King Yan of Huaiyang to Lu.