Lü Long
He was the nephew of the founding emperor Lü Guang ( Emperor Yiwu ) , and he took the throne after his brother Lü Chao ( 呂超 ) assassinated the emperor Lü Zuan ( Emperor Ling ) in 401 and offered the throne to him . 
<triplet> Lü Guang <subj> Lü Zuan <obj> child