[Volundr]

Can you speak more about which ones and how that happened? The main one that comes to my mind is the British monarchy (to the extent that they don't really have much power), and my general impression (not a historian) is that that's a bit of a fluke. Looking at the French and American Revolutions, they sort of realized that their necks might stay better attached if they gave some ground. I'm not sure the monarchy being a participant in it's own reform is really applicable.

[rsynnott]

> The main one that comes to my mind is the British monarchy (to the extent that they don't really have much power)

They don't have much power due to _many, many revolutions_; they may not generally get called that, but the wars leading up to the Magna Carta, and later the English Civil War, were clearly revolutions against the monarchy, and successfully limited its power.

[microtonal]

There are more Western European countries with (constitutional) monarchies (The Netherlands, Denmark, Sweden, Norway), that have become less powerful/more ceremonial over the past decades or even centuries.