Two This is Rigged activists painted over a portrait of Charles in the Scottish National Portrait Gallery in Edinburgh on Wednesday.
Climate activists from This Is Rigged have spray-painted on a portrait of the King, the group has claimed.
Two people from the group sprayed the painting in Edinburgh’s National Portrait Gallery with the words “The people are mightier than the lord”, at around 3pm on Wednesday.
One person held a stencil on the glass covering the painting while the other sprayed it with pink paint, the group said.
Ben Taylor, a 28-year-old gardener from Ayrshire who took action, said: “Why does the Scottish government think it’s acceptable to keep allowing new oil and gas projects to go ahead, without even opposing them?
“If we want a future for our young people, they need to oppose all new oil and gas licences.
“This is the most basic step they can take to secure a chance at a liveable future. Until this happens, we will continue to target the Scottish government, forcing them to use the powers they do have to stand up for the people.”
This is Rigged have been participating in a sustained series of actions designed to target key fuel suppliers in Scotland with blockades.
Four occupations took place at Grangemouth and at the NuStar Terminal in Clydebank, with fuel prevented from leaving both terminals, cutting off the majority of Scotland’s petroleum supplies.
On Sunday, two This is Rigged activists scaled The Kelpies, stating that they would not be “lured underwater” by the fossil fuel industry.