Acclamation of the Kings of Portugal
In 1646, immediately after his Coronation, King John IV of Portugal consecrated the Crown of Portugal to the Virgin Mary, proclaiming her to be the Queen and patroness of his nation. After this act, no Portuguese sovereign ever wore a crown.
The Portuguese monarchy was abolished in 1910.
John IV's Coronation followed a pattern similar to the Coronation of the Kings of France and pre-reformation England, as laid out in the Roman Pontifical. The Habsburg monarchs that preceded John IV as Kings of Portugal were also not crowned; during the Iberian Union, the practice of not having a coronation ceremony was extended to Portugal.
Before the assumption of the Portuguese Throne by the Habsburgs, Kings of Portugal used to be anointed and crowned in the Jeronimos Monastery in Lisbon, in a manner similar to the Coronation of John IV.