From A Wiki of Ice and Fire
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This information has thus far been released in a sample chapter for The Winds of Winter, and might therefore not be in finalized form. Keep in mind that the content as described below is still subject to change.
House Reyaan is a noble family of Braavos. They are keyholders.
The Winds of Winter
Bessaro Reyaan attends the Gate for a perfomance of The Bloody Hand. Daena mentions that all Reyaans are fat, with the father being fattest of all, so fat in fact that he sunk his barge after stepping on it when he was summoned to vote to the Hall of Truth 
The Reyaans at the start of the third century
- Bessaro Reyaan, a keyholder of the Iron Bank of Braavos
- His father