September 1752 was immediately followed by Thursday 14 September 1752; they were joined by the last Protestant holdout, Sweden, on 1 March 1753. The Gregorian calendar was not accepted in eastern Christendom for several hundred years, and then only as the civil calendar. Foreign policy Though he feared invasion of Europe by the Turks, Gregory XIII's attentions were more consistently directed to the dangers from the Protestants. He encouraged the plans of Philip II to dethrone Elizabeth I of England (reigned from 1558 to 1603), resulting in English Protestants suspecting Catholics as potential traitors and subversives. In 1578, to further the plans of exiled English and Irish Catholics such as Nicholas Sanders, William Allen, and James Fitzmaurice FitzGerald, Gregory outfitted adventurer Thomas Stukeley with a ship and an army of 800 men to land in Ireland to aid the Catholics against the Protestant plantations. To his dismay, Stukeley joined his forces with those of King Sebastian of Portugal against Emperor Abdul Malik of Morocco instead. Another papal expedition sailed to Ireland in 1579 with a mere 50 soldiers under the command of Fitzmaurice, accompanied by Sanders as papal legate. They took part in the Second Desmond Rebellion. All of the soldiers and sailors on board, as well as the women and children who accompanied them, were beheaded or hanged on landing in Kerry, in the Smerwick Massacre. In 1580, he was persuaded by English Jesuits to moderate or suspend the Bull Regnans in Excelsis (1570) which had excommunicated Queen Elizabeth I of England. Catholics were advised to obey the queen outwardly in all civil matters, until such time as a suitable opportunity presented itself for her overthrow. After the St. Bartholomew's Day Massacres of Huguenots in France in 1572, Pope Gregory signaled his approval and celebrated a Te Deum mass. Three frescoes in the Sala Regia hall of the Vatican depicting the events were commissioned and painted by Giorgio Vasari. A commemorative medal was issued with Gregory's portrait and on the obverse a chastising angel, sword in hand and the legend UGONOTTORUM STRAGES ("Overthrow of the Huguenots"). Gregory XIII was visited by the Tenshō embassy of Japan, becoming the first Pope to have received such an embassy. Cultural patronage In Rome Gregory XIII built the Gregorian chapel in the Basilica of St. Peter, and extended the Quirinal Palace in 1580. He also turned the Baths of Diocletian into a granary