Afghan President Hamid Karzai met with the Prince of Wales at Clarence House today.
Clarence House declined to reveal what the two men discussed, describing the talks as private.
David Cameron has issued a direct appeal to the Taliban to enter peaceful talks on the future of Afghanistan after hosting talks at Chequers with Afghan President Hamid Karzai and Pakistani President Asif Ali Zardari today.
The Prime Minister said the two leaders had agreed "an unprecedented level of co-operation".
He said they had agreed to sign up to a strategic partnership between their two countries in the autumn.
At the same time, they also agreed to the opening of an office in the Qatari capital Doha for negotiations between the Taliban and the Afghan High Peace Council.
Mr Cameron said the agreement should send a clear message to the Taliban.
"Now is the time for everyone to participate in a peaceful, political process in Afghanistan."
"This should lead to a future where all Afghans can participate peacefully in that country's political process."
In an exclusive interview with ITV News and The Guardian Afghan President Hamid Karzai said that Prince Harry "is a young man and young men do make mistakes talking or behaving, all of us have gone through this period, so let's drop it there."
He was responding to comments made by the Prince while he was in Camp Bastion about killing Taliban in Afghanistan.
President Karzai also paid tribute to Prince Charles saying, "he is a very fine gentleman, a man for whom I have tremendous respect."
Speaking to International Editor Bill Neely, Afghan President Hamid Karzai said he would crack down on so-called insider attacks because the country had a responsibility to protect its allies.
Hamid Karzai spoke to ITV News during a joint interview with The Guardian.
President Karzai tells me the idea of no US and foreign troops remaining after 2014 (the "zero option" that Obama is considering) is "utopian". He tells me he fears for his own life as foreign troops begin to leave but this "comes with the job".
Speaking to ITV News during a joint interview with the Guardian, Afghan President, Hamid Karzai said:
"We see this as a serious breach of hospitality that we have to improve and make better, so it is an important question and we are working on it.
"We should try our best to train our troops better and to inform them better. And, also there has to be a lot more cultural sensitisation by our allies when they send troops to Afghanistan."
The Afghan President Hamid Karzai has pledged to crack down on so-called insider attacks - where Afghans turn their weapons on their coalition colleagues. In a joint interview with The Guardian, he told ITV News that he had a responsibility to protect allies - who were guests in their country.