It is said that he knew about Anakin when he was born, and then he kept an eye on him. Also, when Anakin was brought to Coroscant palpatine knew who he was and kept an eye on him the whole training, and also started shaping him from when he was first being trained. He had always let Anakin come to him and talk so he would put ideas in Anakins head. So yes, palpatine knew!
Emlu
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