A moratorium is in effect on adding information from Fire and Blood until December 20th.
Lord's Mill is a mill in the Riverlands. It is disputed land between House Bracken and House Blackwood. It is currently held by House Blackwood.
Lord's Mill was burned by the dragon Vhagar during the Dance of the Dragons.
Jonos Bracken wants Lord's Mill for subduing Tytos Blackwood. Tytos surrenders Lord's Mill as part of the price to submit to the Iron Throne.