Gandhari
The marriage story of Gandhari and Dhritarashtra is just too simple. Bhishma sent a proposal of marriage of Gandhari with Dhritarashtra through a diplomat to King Subala of Gandhara (modern day Kandhara area including Taxila). He was perplexed and anxious as the would be groom was blind but in the end he accepted the proposal because Hastinapur was a very big and prosperous Kingdom and could be a perfect ally for Gandhara.
Shakuni took his sister to Hastinapur and Gandhari knowing her husband is blind decided to not see things her husband couldn't see and she blindfolded herself and vowed to never see any faults in her husband. With her wise and kind behaviour, she won over her in laws.
Source- Mahabharata