The royals will face anti-monarchy protests at the Commonwealth Day Service in London on March 10th.
As well as opposing the monarchy, protesters will be demanding an end to the Duchy of Lancaster and Duchy of Cornwall. The two estates have been accused of profiting from charities and public services while handing huge incomes to Charles and William.
Republic has been staging a series of protests for the past two years. The Commonwealth event is particularly poignant as the first big royal event of the year and at a time when Commonwealth nations are planning to ditch the monarchy.
Chuck the Rex, a 15ft tall dinosaur puppet, will also be joining the protest in March. Chuck is a new protest prop that symbolises the antiquated monarchy, a relic that belongs in a museum.
Republic's new mascot will appear at other protests throughout the year.
Speaking for Republic, Graham Smith said today:
"There is growing opposition to the royals, and growing disinterest in them. There is also lasting residual anger at their profiteering from charities and public services."
"The Duchies are not their private property, those profits should be going back to local communities."
"It's no wonder that while support is falling in the UK, Commonwealth citizens are increasingly looking to ditch the monarchy."
"Fewer than one in ten Commonwealth citizens have Charles as their head of state. 75% of Commonwealth nations are republics. The Commonwealth has very little to do with the royals."
"Commonwealth countries, notably in the Caribbean, are talking about ditching the royals while demanding reparations from Charles."
"This is why we're protesting Commonwealth Day on March 10th - to challenge the monarchy here in the UK and support Commonwealth nations becoming republics."
"Britain is not a nation of royalists. These continuing protests will keep pushing that message and will embolden a growing movement."
Republic protests and events can be seen on the website at www.republic.org.uk/events.
You can find out more about Chuck the Rex at www.republic.org.uk/chuck.
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