From A Wiki of Ice and Fire
Mouse was a trading cog owned and captained by Marilda of Hull.
After her father passed away, Marilda of Hull sold his shipyard and bought the cog she named Mouse, after her childhood nickname. Within a decade she had become a canny trader who owned seven ships.
When Marilda's son, Alyn Velaryon, agreed to transport King Aegon II Targaryen from Dragonstone back to King's Landing, the king sailed with Marilda on her battered Mouse, rather than a prestigious Velaryon warship.
Lord Alyn might have shipped the king home aboard Lord Aethan's Glory or Morning Tide or even Spicetown Girl, but he wanted him seen to be creeping into the city on a mouse.—writings of Mushroom
- ↑ 1.0 1.1 1.2 Fire & Blood, The Dying of the Dragons - The Short, Sad Reign of Aegon II.
- ↑ Fire & Blood, The Dying of the Dragons - The Red Dragon and the Gold.