re: Crackpot ASOIAF Theories SPOILERS

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The parentage question really locks things down. Let's pretend for a moment that Aegon is really Rhaegar's rescued infant. Why were the other two known Targs, Viserys and Dany, on the run going from house to house for most of their life? Why did Illyrio wait until a couple of years before the start of the series to finally shelter them? We know from ADWD that Illyrio was in fact sheltering infant Aegon right after the war. Why not the other two?

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Robert and others knew that Danny and Viserys were still alive. If Illyrio helps them, he brings attention onto himself and Robert would be more likely too act if Vis and Danny are supported by somebody rich and powerful.

By letting them run free, Illyrio had all of the attention on them not the baby he was raising. Once Robert's attention waned, Illryio was safe to help them.