Rulers of Scotland

Stuck for a subject today. Was trying to unblock a rain drain but didn't take any pictures of that.
Dug out this ruler the other day, I think belongs to one of the offspring. It goes all the way down from where you can see to Elizabeth at around 25cm on the other side. Note that it's Elizabeth not Lizzy II on this one as the other Elizabeth wasn't a queen of Scotland.
It also sent me down the internet rabbit hole looking up the real Macbeth and who Lulach was. Turns out he was Macbeth's stepson. He only lasted 6 months before being bumped off my Malcolm III.
Jude added for scale in background