In 2011, LEGO released 4 Castle sets in the subtheme Kingdoms, all of these sets have been retired. For that year, the total price of all retail sets cost $140, today those sets are valued around $951, a growth of 580%.
Most valuable 2011 LEGO Castle set
7189 Mill Village Raid $396.28
Highest growth 2011 Castle set
7187 Escape from the Dragon's Prison +1635.92%
Most owned 2011 Castle set
6918 Blacksmith Attack
4 sets

6918 Blacksmith Attack

Theme / Subtheme Castle / Kingdoms
Year 2011
Pieces / Minifigs 104 / 2
Availability Retired
6918 LEGO Kingdoms Blacksmith Attack
Retail $9.99
Value $76.87
Growth  +669.5%
Annual growth 14.8%

7187 Escape from the Dragon's Prison

Theme / Subtheme Castle / Kingdoms
Year 2011
Pieces / Minifigs 185 / 4
Availability Retired
7187 LEGO Kingdoms Escape from the Dragon's Prison
Retail $19.99
Value $347.01
Growth  +1635.9%
Annual growth 13.3%

7188 King's Carriage Ambush

Theme / Subtheme Castle / Kingdoms
Year 2011
Pieces / Minifigs 286 / 4
Availability Retired
7188 LEGO Kingdoms King's Carriage Ambush
Retail $39.99
Value $130.95
Growth  +227.5%
Annual growth 13.8%

7189 Mill Village Raid

Theme / Subtheme Castle / Kingdoms
Year 2011
Pieces / Minifigs 663 / 6
Availability Retired
7189 LEGO Kingdoms Mill Village Raid
Retail $69.99
Value $396.28
Growth  +466.2%
Annual growth 6.2%