'Laelius' is a personal name and can refer to:
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Gaius Laelius, a Roman statesman, who was consul in 190 BC and friend of
Scipio Africanus
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Gaius Laelius Sapiens (consul of 140 BC), a Roman statesman, son of the above, who was consul in 140 BC, and was friend to Scipio's adoptive grandson
Scipio Aemilianus
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Laelius de Amicitia, a philosophical dialog by Cicero on friendship, which is based on the second Gaius Laelius and his relationships with various great men
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Laelius Socinus, a 16th Century Humanist and Reformer
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Robert Pipon Marett, a Jersey poet who used the pen name ''Laelius''