Over the weekend, U.S. President Donald Trump's daughter Ivanka Trump posted an Instagram photo of her looking at a historic photo that captures the first time an American president ever met with a Saudi king. 

In the photo, which was taken during her trip to Saudi Arabia last month, Ivanka Trump is seen standing alongside a man believed to be her husband, presidential adviser Jared Kushner.

"#FBF (Flashback Friday) to President Trump’s foreign trip last week, while admiring this historic photo of President Roosevelt’s first meeting with Saudi King Abdulaziz in 1945," the photo's caption read.

The photo was taken this May when the Kushners accompanied President Trump during his trip to the Saudi kingdom - his very first international destination as president.

During his visit, Trump attended the kingdom's international Islamic summit and met with leaders of nations from the Gulf Cooperation Council, as well as leaders of other Muslim nations including Turkey, Azerbaijan, Nigeria and Indonesia. 

Meanwhile, his daughter discussed female empowerment aRiyadh's Tuwaiq Palace with a group of prominent Saudi women in business and society.

Speaking about her trip, she noted that Saudi Arabia has seen "very encouraging" progress in women's empowerment, adding that there is "still a lot of work to be done and freedoms and opportunities to continue to fight for."

What is the story behind the photo?

The photo the Kushners are admiring in the post marks the beginning of American-Saudi relations, as it was taken during the first-ever meeting between a U.S. president and a Saudi King, according to The Washington Post.

The meeting took place when the American president at the time, the 32nd President of the United States President Franklin D. Roosevelt, was returning home from the Yalta Conference in 1945, where world leaders had discussed the future of a postwar Europe. 

Roosevelt decided to meet with some of the Middle East and Africa's most important leaders, including King Farouk of Egypt and Saudi Arabia's first king, Abdul Aziz ibn Saud.

The meeting took place over several days in the Suez Canal, aboard a U.S. Navy cruiser ship, marking the first time King Abdulaziz left the country.

The heads of state discussed several political issues, focusing on the plan to find European Jews a new home in Palestine, which Abdul Aziz opposed.

"Your Majesty will also doubtless recall that during our recent conversation I assured you that I would take no action, in my capacity as Chief of the Executive Branch of this Government, which might prove hostile to the Arab people," Roosevelt wrote to the Saudi king in a follow up letter, in which Roosevelt referred to himself as the king's "good friend".