Romania's former King Michael died on December 5 in Switzerland at the age of 96, the royal house says.
The king had been seriously ill for more than a year and a half.
King Michael I, who had been the last living monarch from Eastern European countries, had withdrawn from public life in March 2016, when the royal house announced he had been diagnosed with skin cancer and leukemia.
The former king had also undergone surgery in a clinic in Lausanne. His condition had worsened since November 6.
A cousin of Britain's Queen Elizabeth, Michael was forced to abdicate in 1947 after the postwar communist takeover of Romania and had lived in exile in the West for decades.