The Duke and Duchess of Sussex will meet Morocco's ruler King Mohammed VI later today - but there will be no sign of his wife Princess Salma by his side, despite having natural common ground with Meghan as a keen supporter of women's rights.

Dubbed Morocco's 'missing princess', Lalla Salma, now 40, has not been seen in public since the end of 2017 when she visited the Mohammed VI Museum in Rabat - and there has been endless speculation surrounding her whereabouts.

Some believe the mother-of-two has divorced from King Mohammed and is being hidden in Morocco, while others think she may be living in exile in the US, or on the Greek Island of Kea with the couple's youngest daughter, Princess Lalla Khadija, 11.

However, the palace has never confirmed the couple's rumoured split and the Moroccan media has reportedly chosen to ignore the princess' disappearance from public life.

Women's rights has formed the backdrop of the couple's trip with Meghan giving an impassioned speech last night at the British ambassador's residence, calling on women around the world to push boundaries to advance their cause.

But it's not known if the Duke and Duchess will raise the princess' absence with her husband during their meeting later on today.

Princess Lalla Salma has been 'missing' for two years - and there has been much speculation about her whereabouts. Above, she attended a dinner hosted by Queen Beatrix of The Netherlands ahead of her abdication in favour of Crown Prince Willem Alexander at Rijksmuseum on April 29, 2013 in Amsterdam, Netherlands

King Mohamed VI of Morocco with his wife Princess Lalla Salma on their wedding day on July 13, 2002 in Rabat, Morocco. Public celebrations for the Moroccan king's marriage took place, which broke a tradition of keeping royal wives hidden

Meghan and Harry are due to meet King Mohammed VI of Morocco, 55, later today - and while the media has ignored the mystery surrounding the 40-year-old's disappearance, it is not known whether the British royals will ask after her. Above, the royal couple watch children playing football at a school in the town of Asni, in the Atlas mountains, Morocco yesterday

Princess Lalla Salma met the Moroccan King at a party back in 1999 and married several years later following a series of lavish public celebrations, which broke a tradition of keeping royal wives hidden.

It is is widely believed the pair have since divorced, but the palace has never officially confirmed such details.

The Princess hasn't been seen at any engagements since late 2017 - even those relating to The Lalla Salma Foundation, a cancer charity she founded.

During their stay in Morocco, Harry and Meghan have already met the couple's son Crown Prince Moulay Hassan, 15, who is one of the 'richest teenagers in the world'.

Dubbed Morocco's 'missing' princess, it is not known where the mother-of-two resides, with some believing she has been hidden in Morocco. Above, pictured at Rabat Airport on July 15, 2014

Some believe Princess Lalla Salma of Morocco may be living in exile in the US, or on a Greek Island of Kea with the couple's youngest daughter, Princess Lalla Khadija, 11. Above, she arrived at the Nieuwe Kerk in Amsterdam for the inauguration ceremony of King Willem Alexander of the Netherlands, on April 30, 2013

Princess Lalla Salma has not been seen in public since the end of 2017 when she visited the Mohammed VI Museum in Rabat. Pictured above after the wedding ceremony of Prince Guillaume Of Luxembourg and Princess Stephanie of Luxembourg at the Cathedral of our Lady of Luxembourg on October 20, 2012 in Luxembourg

The 'missing' princess attended Kate Middleton and Prince William's wedding in 2011. Pictured leaving the Royal Palace after brunch with King Willem Alexander and Queen Maxima of The Netherlands on May 1, 2013 in Amsterdam

He greeted the royal pair with a hand shake as they entered the villa in the grounds of King Mohammed's palace after they landed at Casablanca airport yesterday evening.

It is thought to be the first time that the British royal family have met the future monarch of Morocco.

'I think Salma had a very hard job trying to be the first visible wife of a Moroccan king,' Netty Leistra, a royal journalist, told Royal Central. 'There is quite an age gap too.

'Salma did some good things and of course, gave birth to two children. I always thought she did rather well.

'I guess that if the news is correct about the divorce, they will give her a nice big house and all the money she needs so that she won't say anything about it. But I think it is rather sad if it is true.'

The Duchess, who has made women’s empowerment a key part of her work, has discussed issues facing women during her trip.

The couple, who arrived on Saturday to kick off a three-day tour, walked up a red carpet which had been laid for their arrival

Meghan and Harry's three-day trip has focused on the subject of female empowerment. Above, they walked in without seeing Rania and Rayhana, pictured, who were waving a British and Moroccan flags, but they spotted them as they left and Meghan immediately made a beeline for the sisters and bent down to say hello (pictured)

She had a conversation with Meriem Bensalah, chief executive of finance and agricultural firm the Holmarcom Group, who told her that Moroccan women had made great advances towards equality but still faced disadvantages.

The Duke and Duchess of Sussex have also traveled to the town of Ansi in the foothills of the Atlas Mountains to visit a secondary school and meet pupils.

The Duchess, who impressed by speaking in French, also took part in a traditional henna ceremony.