Although he remained undisturbed during his meal, Spanish tourists later noticed Queen Sofía and a Greek civilian recognised the former king, who was being pushed in a wheelchair with nasal catheters that provided him with supplementary oxygen, prompting concerns for his health.

[citation needed] His heart and mobility issues had "worsened" in the twelve months prior to his death and resulted in multiple hospitalisations in 2022.

[citation needed] Constantine's daughter-in-law, Princess Tatiana, was seen lighting a candle at church in prayer for his health.

[citation needed] He had been placed in the intensive care unit of the private Hygeia Hospital following a stroke, but died on 10 January 2023.

"[5] Despite the abolition of the monarchy in 1973, Constantine never formally renounced his title as King of the Hellenes due to Greek Orthodox tradition, which holds that an anointed monarch retains their status until their death.

[9][10] Following Constantine's death, it was announced a discussion would be held later that day at the Maximos Mansion to decide whether a state funeral is appropriate.

[citation needed] It was also announced that his burial location would be at Tatoi Palace, where other past Greek royal family members have been buried.

[citation needed] Police also stated that they would "have a presence at vital points around the Metropolitan Cathedral and Tatoi, as well as the funeral procession's route and the locations where invited officials stay.

"[14] Royal guests began arriving in Greece on 15 January 2023 and most of them stayed at the Hotel Grande Bretagne, where both reporting mediai and crowds greeted them.

[citation needed] Constantine's body laid in the Agios Eleftherios Chapel from 6:00 am till 11:00 am (UTC+2), allowing members of the public to pay their respects.

Τhe procession was headed by a crucifer, followed by two priests, including Archbishop Ieronymos II, then the coffin, which was draped in the current flag of Greece, and finally Constantine's three sons, with crowds watching from the side.

"[17] Constantine's body was moved through the church's nave then placed in the centre of the chancel with wreaths, icons and medals surrounding it.

[citation needed] Archbishop Ieronymos II presided over the ceremony, standing at the front of the church with almost twenty other priests.

[citation needed] The recessional consisted of the same order as the procession, except with the whole Greek royal family followed by all guests at the end.

[citation needed] After the funeral, with police escort and five supervising drones and two helicopters, Constantine's body was driven 29 kilometres to Tatoi Palace via Metropolitan Road, which was closed to the public from 6:00 am to 2:00 pm (UTC+2).

At the burial comittal ceremony, Constantine's coffin was covered in a wreath, his Olympic medal and the monarchical flag of Greece.

[26] On 10 January 2024, the first anniversary of Constantine's death, a private memorial service was held in Tatoi and was attended by his immediate family.

[70] After the Lord's Prayer was read in English and in Greek, the British national anthem was sung to conclude the service.

[73] Charles, who was unable to attend due to his cancer treatment, was spotted honouring Constantine by wearing a Greek tie days later.