The Castle of the Lost King

This, the most important Location in the Lands of Lord British, can be found on the north shore of the inner sea. To reach it, head north from Paws, then west after passing the mountains. You have to complete the King's Quest to finish the game. Because this castle features so many tight passages, it is not recommended that you rob it or try to save the Princess here.
Compare The Castle of the Lost King to other Locations
Quests: Started in The Castle of the Lost King – 1 shown
The conditions required to complete the quest
Quest
The reward the king will give you upon returning after the quest is complete
Reward
Kill a Gelatinous Cube Red Gem
Magic Waters: Found in The Castle of the Lost King – 2 shown
Which body of water within the castle or city has these properties
Body of Water
What type of bonus dropping coins in this body of water may result in
Bonus To
The amount of the bonus based on the number of coins dropped
Bonus Amount
East half of water Food 300% of pence dropped
West half of water Random Stat 10% of pence dropped (round down)
Creatures: Found in The Castle of the Lost King – 4 shown
The name of the creature; note that creatures of the same name that appear in different types of areas (e.g., the overworld or dungeons) are different creatures with different statistics; dungeon creatures are found only on certain dungeon levels; city creatures are not normally aggressive; kings are worth a great deal of experience if defeated; you must defeat the final boss to complete the game
Name
The location where you can find this creature; all of the lands and seas of Sosaria are home to the same types of creatures, regardless of continent
Location
The creature's starting hit point total; creatures in dungeons have randomly determined hit points
HP
The range of damage this creature's attack may inflict on a hit
Damage
Any special notes about the creature's special abilities, attack range, and so on
Notes
Guard Cities and Castles 500 2–91 Will attack if you damage anyone or are caught stealing
Jester Castles 1 - Will sometimes steal your highest-tier unequipped weapon when adjacent; drops the key to a random prison cell
King Castles ? - Has very high HP, but does not move or fight back
Princess Castles 1 - -
The Castle of Lord British The Castle Barataria

Related

Lands of Lord British

Page 2
Win the Red Gem in The Castle of the Lost King and obtain a vehicle that can cross water.

The Castle of the Lost King

This, the most important Location in the Lands of Lord British, can be found on the north shore of the inner sea. To reach it, head north from Paws, then west after passing the mountains. You have to complete the King's Quest to finish the game.