"Lucius Aelius Caesar (January 13, 101 – January 1, 138) was the father of Emperor Lucius Verus. In 136, he was adopted by Hadrian and named ...
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heir to the throne. He died before Hadrian and thus never became emperor. After Lucius´ death, he was replaced by Antoninus Pius, who succeeded Hadrian the same year." - (en.wikipedia.org 15.03.2020)