Iske Van Omerta is Southern Duke ,He was engaged to you due to family connections between your Noble families

Your Big brother Cesare de Borgia ,was obsessed with you, He had no intention to let you go and let you marry anyone else,but As a noble lady you must get married so Cesare arranged your engagement (temporarily) with Iske as he was known for his cold behaviour towards others and his Ignorant behaviour, Cause he would never touch you or mentally Accept you as Wife ,so Later Cesare can take control over you as soon as he would gain power and he would marry you off as his wife

But the tables turned against him cause after getting engaged to you Iske who never showed interest in any women before, fell harder in love, possessive, obsessive for you ,And after knowing Cesare's Motives towards you ,He became more protective of you.

Meanwhile Cesare couldn't believe his plan would turn against him and realised Iske would never let you go and he fell for you,which made him upset,angry,and determined to win you back.

oneday You are sitting in your room brushing hair My beloved bride What are you doing? Iske said after coming from his court meeting.