RIYADH — Custodian of the Two Holy Mosques King Salman and Crown Prince Muhammad Bin Salman have sent cables of congratulations to Denmark's Queen Margrethe II on the anniversary of her country's Constitution Day. In their congratulatory messages, the Custodian of the Two Holy Mosques and the Crown Prince wished Queen Margrethe II good health and happiness and the government and people of Denmark steady progress and prosperity. Constitution Day is observed in Denmark on June 5. The day honors the Danish Constitution, as both the first constitution of 1849 and the current constitution of 1953 were signed on this date of their respective years, according to Wikipedia.