The 12th century is the 1100s for when Edinburgh Castle was built but people lived on this rock since at least 850 BC

When was the Edinburgh castle built?

Edinburgh Castle is built high on an impressive 700 million year old extinct volcano called Castle Rock, in the middle of what is now the city of Edinburgh. People have lived on Castle Rock since the Bronze Age, around 850 BC, and there has been a royal castle on the site since at least the 12th century. 2.

I realized I couldn't quote the following because it is in a PDF format. So, please click on it if you want to read about it.

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Ten Fantastic Facts and Legends of Edinburgh Castle ... - TeaTime-Mag

https://www.teatime-mag.com/wp-content/themes/tt/.../customs-and-culture-post-a4.pdf