Harry St John Abdullah Philby on his 1917 trek across the Arabian Peninsula, which he recorded in his 1922 book 'Heart of Arabia'.
Philby in 1925. Getty
Philby converted to Islam, taking the name Abdullah, and spent decades in Arabia as a close adviser to the first Saudi King Abdulaziz, known as Ibn Saud. Alamy
Philby was a meticulous note-taker and provided valuable information for maps to the Royal Geographical Society in London. Getty
The Heart of Arabia team - Mark Evans MBE, Ana-Maria Pavalache, Reem Philby, and Alan Morrissey - with one of the two support cars they will be taking on the expedition. Photo: Osama Farhan / British Embassy Riyadh
The team pose with the second support vehicle for the trip, nicknamed "the beast" by head of logistics Alan Morrissey. Photo: Osama Farhan / British Embassy Riyadh
The team departed from Riyadh to Al Uqair on the morning of November 14. Photo: Osama Farhan / British Embassy Riyadh
Prince Sultan bin Salman and the Heart of Arabia team, along with members of the Philby family and the UK ambassador to Saudi Arabia, Neil Crompton. Photo: Osama Farhan / British Embassy Riyadh
British royal Princess Anne at the September launch of the Heart of Arabia Expedition. She is the patron of the organisation. All subsequent photos: Matthew Tomkinson / Heart of Arabia Expedition
The expedition team: Mark Evans, Reem Philby, Ana-Maria Pavalache and Allan Morrissey.
Princess Anne in conversation with Mark Evans and Saudi ambassador to the UK Prince Khalid bin Bandar at the launch.
Princess Anne is the patron of the Royal Geographical Society, which awarded Philby its Gold Medal for his exploration of Arabia.
Princess Anne at the launch exhibition in London.
Harry St John Abdullah Philby on his 1917 trek across the Arabian Peninsula, which he recorded in his 1922 book 'Heart of Arabia'.
Philby in 1925. Getty
Philby converted to Islam, taking the name Abdullah, and spent decades in Arabia as a close adviser to the first Saudi King Abdulaziz, known as Ibn Saud. Alamy
Philby was a meticulous note-taker and provided valuable information for maps to the Royal Geographical Society in London. Getty
The Heart of Arabia team - Mark Evans MBE, Ana-Maria Pavalache, Reem Philby, and Alan Morrissey - with one of the two support cars they will be taking on the expedition. Photo: Osama Farhan / British Embassy Riyadh
The team pose with the second support vehicle for the trip, nicknamed "the beast" by head of logistics Alan Morrissey. Photo: Osama Farhan / British Embassy Riyadh
The team departed from Riyadh to Al Uqair on the morning of November 14. Photo: Osama Farhan / British Embassy Riyadh
Prince Sultan bin Salman and the Heart of Arabia team, along with members of the Philby family and the UK ambassador to Saudi Arabia, Neil Crompton. Photo: Osama Farhan / British Embassy Riyadh
British royal Princess Anne at the September launch of the Heart of Arabia Expedition. She is the patron of the organisation. All subsequent photos: Matthew Tomkinson / Heart of Arabia Expedition
The expedition team: Mark Evans, Reem Philby, Ana-Maria Pavalache and Allan Morrissey.
Princess Anne in conversation with Mark Evans and Saudi ambassador to the UK Prince Khalid bin Bandar at the launch.
Princess Anne is the patron of the Royal Geographical Society, which awarded Philby its Gold Medal for his exploration of Arabia.