Senator Lidia Thorpe waited until the end of a landmark speech Charles gave at Australia’s Parliament House, in the nation’s capital of Canberra, to verbally attack him and claim “genocide” had been committed against the Commonwealth country’s indigenous people.

Charles and Camilla have faced low-key protests during their tour of Australia, which began on Monday, from supporters of First Nations resistance to colonisation, who have been displaying a banner with the word “decolonise” at a number of events.

As Ms Thorpe was gently ushered from the hall she shouted: “You are not our King you are not Sovereign… you have committed genocide against our people.

“Give us our land back. Give us what you stole from us… Our babies, Our people. You destroyed our land.”

She continued: “Give us a treaty – we want a treaty with this country… This is not your land, this is not your land, you are not my King you are not our King.”

The outburst from an elected representative will likely be seen as an embarrassment for Charles making his first visit to Australia as King.

Ms Thorpe sits as an independent in the upper house of the Australian parliament and ahead of the royal visit issued a statement saying through treaty negotiations,

“As First Peoples, we never ceded our Sovereignty over this land. The Crown invaded this country, has not sought treaty with First Peoples, and committed a Genocide of our people. King Charles is not the legitimate Sovereign of these lands,” she said before her mini-protest.

“Any move towards a republic must not continue this injustice. Treaty must play a central role in establishing an independent nation. A republic without a Treaty must not happen.”

It is understood the King was unruffled and would not let the outburst overshadow what the royal party viewed as a wonderful day in the Australian capital, which had seen them greet hundreds of well-wishers at the national war memorial – including a sneezing alpaca.

Crowd gathers to see King Charles

Hundreds of people earlier gathered outside Australia’s parliament house for a chance to meet the royal couple.

Australia’s prime minister Anthony Albanese has a long-held aim of holding a referendum on breaking ties with the British monarchy and his country becoming a republic.

But the plans were put on hold after Australians overwhelmingly rejected a plan to give greater political rights to Indigenous people in a referendum held last year.