Simplify the following text for a Grade 9 native English-speaking person.
Original: The Royal Standard of Scotland , also known as the Banner of the King of Scots or more commonly the Lion Rampant of Scotland , is the Scottish Royal Banner of Arms . Used historically by the King of Scots , the Royal Standard of Scotland differs from Scotland 's national flag , The Saltire , in that its correct use is restricted by an Act of the Parliament of Scotland to only a few Great Officers of State who officially represent The Sovereign in Scotland .
Simplified: The Royal Standard of the King of Scots , also known as the Royal Flag of Scotland or the Lion Rampant , is the flag used historically by the King of Scots .