The Normans introduced the first proper castles, starting with the wooden Motte and Bailey castles, to England following their victory at the Battle of Hastings in 1066. They needed to protect their new kingdom, so as a result the early years of Norman occupation saw a frenzy of castle building.

What was in a castle moat? 

A moat is a deep, broad ditch, typically filled with water, that surrounds a castle, building or town. Historically, it provided a preliminary line of defence. In some places moats evolved into more extensive water defences, including natural or artificial lakes, dams and sluices. 

How did a moat help defend a castle? 

The purpose of a moat was primarily to protect the castle from attack. As a defense mechanism, moats were very effective. Although they're usually depicted as wide, deep bodies of water, moats were often simply dry ditches. ... Castles, on the other hand, offered safety in the form of strong walls and fortifications 

What is an economic moat? 

The term economic moat, popularized by Warren Buffett, refers to a business' ability to maintain competitive advantages over its competitors in order to protect its long-term profits and market share from competing firms