Despite troubled relations, Iran’s foreign minister was among the first to arrive in Saudi Arabia on Saturday to pay respects to the late King Abdullah.
The 90 year-old died on Friday after a lung infection.
World leaders are flying in to give their condolences in person including President Obama on Tuesday.
Several monarchs travelled to Riyadh including King Felipe of Spain and King Willem Alexander of the Netherlands.
Former Turkish President Abdullah Gul attended a funeral prayer for the late King.
French President Francois Hollande also met with Abdullah’s successor King Salman. British Prime Minister David Cameron was due in the Kingdom later in the day.
King Abdullah was laid to rest after Friday prayers in an unmarked grave.
Other ceremonies of remembrance are taking place over the next few days.