There'll be a change in monarch at Hutt River Province in WA's Mid West region this weekend, with Prince Leonard abdicating and his youngest son taking over.
Hutt River Province is making final preparations for the abdication of its 91-year-old self-proclaimed prince and the enthronement of his youngest son.
The 75 square kilometre principality, a privately-owned wheat property north of Geraldton in WA's Mid West region, claims to have seceded from Australia after a row over low wheat production quotas in 1970.
Leonard Casley, who has reigned since foundation, plans to abdicate his sovereignty on Saturday due to declining health, in a chapel named after his wife Princess Shirley, who died in 2013 aged 84.
The enthronement of Prince Graeme, 60, will also take place there.
He said all who wanted to attend were welcome.
"We've always had open doors. Tourists and locals have come on through and this is no exception," he told AAP.
"Being the first abdication on the Australian continent, it's going to generate a lot of interest.
"The ceremony is to celebrate dad's 46-plus years of reign and pass over the sovereignty to me, so a double celebration.
"It's a little bit sad to see the end of an era with dad stepping down.
"But between him and mum, Princess Shirley, he set some really strong foundations for the principality and our beliefs and principles - things we can build on and step forward into the future."
Prince Graeme says he has three sons aged in their 30s who can step into his shoes when the time comes.
While it has never been recognised by the government and is subject to state and commonwealth laws, Hutt River Province received an official nod in a letter from Queen Elizabeth II last year on its 46th anniversary.
The tourist attraction has even printed its own postage stamps and currency.
It has 10,000 non-resident citizens and a treaty with the indigenous land owners.
"Out of friendship - no money was asked for," Prince Graeme said.
"We're possibly the only government on the Australian continent with such a treaty."