6 Then all the citizens of Shechem and Beth Millo gathered beside the great tree at the pillar in Shechem to crown Abimelek king.

Read Judges 9:6 Using Other Translations

And all the men of Shechem gathered together, and all the house of Millo, and went, and made Abimelech king, by the plain of the pillar that was in Shechem.
And all the leaders of Shechem came together, and all Beth-millo, and they went and made Abimelech king, by the oak of the pillar at Shechem.
Then all the leading citizens of Shechem and Beth-millo called a meeting under the oak beside the pillar at Shechem and made Abimelech their king.