Rehoboam went to Shechem,1 for all the Israelites had gone there to make him king.
References for 1 Kings 12:1
When Jeroboam son of Nebat heard this (he was still in Egypt, where he had fled2 from King Solomon), he returned from Egypt.
References for 1 Kings 12:2
So they sent for Jeroboam, and he and the whole assembly of Israel went to Rehoboam and said to him:
"Your father put a heavy yoke3 on us, but now lighten the harsh labor and the heavy yoke he put on us, and we will serve you."
References for 1 Kings 12:4