John Gill, on Esth 5:13

Then said Zeresh his wife, and all his friends, unto him,.... His wife very probably first moved it, and all his friends present approved of it and united in it: let a gallows be made, of fifty cubits, high; that the person hanged thereon might be seen at a distance, and so be a greater reproach to him, and a terror to others, to take care they were not guilty of the same offence: Cartalo was ordered by his father to be fixed to the highest cross in the sight of the city (l); and it was usual for crosses to be erected very high (m) both for that purpose, and for greater infamy and disgrace (n): and tomorrow speak thou unto the king that Mordecai may be hanged thereon; get a grant from him for it; of which they made no doubt, since Haman had such an interest in him, and had already obtained an order to destroy all Jews in his dominions: then go thou in merrily with the king unto the banquet; eased of the burden of his mind, and honoured to be a guest with the royal pair: and the thing pleased Haman, and he caused the gallows to be made; but it was for himself, as it proved in the issue. See Est 7:10. (l) Justin e Trogo, l. 18. c. 7. Vid. l. 22. c. 7. (m) Vid. Lipsium de Cruce, l. 3. c. 13. (n) Suetonius in Galba, c. 9. Next: Esther Chapter 6