In 1995, LEGO released 5 Castle Royal Knights sets, all of these sets have been retired. For that year, the total price of all retail sets cost $153, today those sets are valued around $4,660, a growth of 2946%.
Most valuable 1995 LEGO Castle Royal Knights set
6090 Royal Knight's Castle $3,707.68
5 sets

6008 Royal King

Theme / Subtheme Castle / Royal Knights
Year 1995
Pieces / Minifigs 10 / 1
Availability Retired
6008 LEGO Royal Knights Royal King
Retail $3.50
Value $112.74
Growth  +3121.1%
Annual growth 8.2%

6036 Skeleton Surprise

Theme / Subtheme Castle / Royal Knights
Year 1995
Pieces / Minifigs 74 / 2
Availability Retired
6036 LEGO Royal Knights Skeleton Surprise
Retail $7.99
Value $157.02
Growth  +1865.2%
Annual growth 7.2%

6044 King's Carriage

Theme / Subtheme Castle / Royal Knights
Year 1995
Pieces / Minifigs 124 / 4
Availability Retired
6044 LEGO Royal Knights King's Carriage
Retail $16.50
Value $293.93
Growth  +1681.4%
Annual growth 7.4%

6078 Royal Drawbridge

Theme / Subtheme Castle / Royal Knights
Year 1995
Pieces / Minifigs 258 / 5
Availability Retired
6078 LEGO Royal Knights Royal Drawbridge
Retail $29.99
Value $388.27
Growth  +1194.7%
Annual growth 6.4%

6090 Royal Knight's Castle

Theme / Subtheme Castle / Royal Knights
Year 1995
Pieces / Minifigs 764 / 11
Availability Retired
6090 LEGO Royal Knight's Castle
Retail $94.99
Value $3,707.68
Growth  +3803.2%
Annual growth 9.3%