Apparently, because Conan had tons of money to splurge for the budget on Aries and Abel's union, he planned to host a banquet of the century. Thanks to Ismael, who had sent a word about his plan in taking the Land of Rikhill as an official state of the Maganti empire and it must be treated as one immediately, there were more things to celebrate about.
Although the soldiers Ismael sent to assist the land of Rikhill hadn't arrived yet, those officials who had been in charge of the land had already fled. The news of the revolt in the Maganti Empire and the fall of the evil crown prince had spread faster than anyone could catch up.
All this time, during Aries's recovery, Ismael had been working nonstop to put things in place. And as such, everyone had also heard about Curtis, a captive from Rikhill, and his involvement in the revolt. Thus, he was rewarded with the title of the Grand Duke of Rikhill.