None of the original Moorish glass of the Alhambra has survived till nowadays. Most of it was destroyed by the explosion, in the year 1590, of a powder factory which lay immediately beneath the palace and beside the river Darro. In the Alhambra archives, particular mention is made of the circular glass windows or "eyes," only the corresponding holes of which remain, in the baths of the same palace. This glass, which may have been in colour, was also destroyed by the explosion, as were the windows, "painted in colour with fancy devices and Arabic lettering," of the Sala de Embajadores,[106] those of the Hall of the Two Sisters, and certain windows, "painted with many histories and royal arms," belonging to the church of the Alhambra. [106] Oliver, _Granada y sus monumentos árabes_. Excellent glass, reported by some authors to have equalled that of Venice, was made at Barcelona from as early as the thirteenth century. An inventory of the Crown of Aragon, dated A.D. 1389 and quoted by García Llansó, mentions as manufactured here, glass sweetmeat-vessels, cups, and silver-mounted tankards blazoned with the royal arms. The guild of Barcelona glassmakers was founded in 1455, and later in the same century Jerónimo Paulo wrote that "glass vessels of varying quality and shape, and which may well compete with the Venetian, are exported to Rome and other places." Similar statements are made by Marineus Siculus and Gaspar Barreyros. Other centres of Spanish glass-making were Caspe in Aragon, Seville, Valencia,[107] Pinar de la Vidriera, Royo Molino (near Jaen,) El Recuenco (Guadalajara), Cebreros (Avila), Medina del Campo, Venta del Cojo, Venta de los Toros de Guisando, and Castiel de la Peña in Castile. The glass-works of Castiel de la Peña were founded by the intelligent and indefatigable Hernando de Zafra, secretary to the Catholic sovereigns, Ferdinand and Isabella. "It has been calculated," says Riaño, "that about two tons of sand were used at these glass-works every month." [107] The inventory (A.D. 1560) of the Dukes of Alburquerque mentions "a white box with four small bottles of Valencia glass containing ointment for the hands." Other objects specified in this inventory are "a large glass cup, with two lizards for handles, and two more lizards on the cover"; "three glass cocoanuts, partly coloured and with gold blown into them, together with their covers"; and "a large glass cup, of Barcelona, blown with gold." The value of these cups, if they existed now, would not be less than two or three hundred pounds apiece.