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.
1978 LEGO Sets
In 1978, LEGO released several new sets and themes, including the LEGO City theme, which expanded upon the city sets released in previous years and introduced new models of public transportation such as buses and taxis.