was it a kind of favor to to this person?
Antoninus was gravely ill when he passed the state to Marcus Aurelius. He died two days later.
Marcus Aurelius
Two days before his death, the biographer reports, Antoninus was at his ancestral estate at Lorium, in Etruria, about 19 kilometres (12 mi) from Rome. He ate Alpine cheese at dinner quite greedily. In the night he vomited; he had a fever the next day. The day after that, 7 March 161, he summoned the imperial council, and passed the state and his daughter to Marcus. 
when did the roman empire end and start It officially started in 27 BC, got split into the Western and Eastern Roman Empires in between and ended with the fall of Constantinople in 1453. who was the ruler then? UNANSWERABLE what was the status of women then? Freeborn Roman women were considered citizens throughout the Republic and Empire, but did not vote, hold political office, or serve in the military. what was the government structure like? The three major elements of the Imperial Roman state were the central government, the military, and provincial government. can you name any personality from this entire empire be it a man or a woman? Emperors Augustus, Caligula, Hadrian, Marcus Aurelius among many other illustrious rulers. from which family did the fourth person originate? Through his grandmother Rupilia, Marcus was a member of the Nerva-Antonine dynasty. which are the good emperors of this dynasty? The so-called "Five Good Emperors" were Nerva, Trajan, Hadrian, Antoninus Pius and Marcus Aurelius. has this last emperor succeeded the third one? No, he was not the immediate successor to Hadrian. then who was? Antoninus Pius
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Marcus Aurelius [SEP] Antoninus Pius' last years
The day after that, 7 March 161, he summoned the imperial council, and passed the state and his daughter to Marcus. The emperor gave the keynote to his life in the last word that he uttered when the tribune of the night-watch came to ask the password – 'aequanimitas' (equanimity). He then turned over, as if going to sleep, and died. His death closed out the longest reign since Augustus, surpassing Tiberius by a couple of months.