Cachupín of Santa Fe de Nuevo México, a province that now comprises most of the American state of New Mexico, begins the first peace negotiations with the indigenous Comanche tribe after inviting tribal representatives to his home in Taos. As a sign of good faith, he unconditionally releases the four Comanche prisoners of war held at Taos. One of the released Comanches reports to his father, Chief Guanacante, about the hospitality extended to him during his imprisonment, and more meetings take place in July and in the autumn. April 12 The Kingdom of Afghanistan, under the rule of Ahmad Shah Durrani, recaptures the city of Lahore four years after its capture by the Sikhs of Punjab. The Real Academia de Bellas Artes de San Fernando, Spain's Royal Academy of the Fine Arts, is formally established in Spain, eight years after first being proposed to King Fernando VI by Jeronimo Antonio Gil as a small school in Madrid. The foundation of the Royal Academy is considered by historians to be "an essential step in modernizing Spain" during the Spanish Enlightenment. April 13 – The oldest property insurance company in the United States, "Philadelphia Contributionship for the Insurance of Houses from Loss by Fire", holds its organizational meeting at the courthouse in Philadelphia to elect a board of directors, largely through the efforts of Benjamin Franklin. Franklin's newspaper, The Pennsylvania Gazette, has been advertising the meeting since February 18, with a notice that "All persons inclined to subscribe to the articles of insurance of houses from fire, in or near this city, are desired to appear at the Court-house, where attendance will be given, to take in their subscriptions, every seventh day of the week, in the afternoon, until the 13th of April next, being the day appointed by the said articles for electing twelve directors and a treasurer." The property insurance company is still in existence more than 250 years later. April 22 – Adam Smith, appointed the year before as a professor of logic, is unanimously elected by the faculty of the University of Glasgow to be the new Professor of Moral Philosophy "on the express condition that he would content himself with the emoluments of the Logic Professorship until 10 October", in that the 1751-1752 salary budgeted for the job has already been distributed to faculty members who had substituted for the previous moral philosophy professor, Thomas Craigie; from