The Castle theme is one of LEGO’s primary themes first introduced in 1978 and based around medieval life with castles and knights. It is currently the third longest-lived theme in LEGO history. Over the years it saw numerous changes thus introducing various fantasy elements.
2 sets

7952 Kingdoms Advent Calendar

Theme / Subtheme Castle / Seasonal
Year 2010
Pieces / Minifigs 167 / 9
Availability Retired
7952 LEGO Kingdoms Advent Calendar
Retail $34.99
Value $98.51
Growth  +181.5%
Annual growth 6.8%

7979 Castle Advent Calendar

Theme / Subtheme Castle / Seasonal
Year 2008
Pieces / Minifigs 176 / 9
Availability Retired
7979 LEGO Castle Advent Calendar
Retail $29.99
Value $179.21
Growth  +497.6%
Annual growth 9.1%