Spanish Interest.- 16th-18th Century Selection of documents related to prominent Spanish personalities from the 16th to the 18th century, comprising: autograph letter signed ('Diego de Velasco') in Spanish to Count Troilo of San Secondo, appointing him captain of a company of men of arms with a wage of 28 scudos per month, one page, integral blank, tear and small loss to lower margin, right margin and upper right corner, minor soiling, folio , Milan, 12 July 1591; a group of letters addressed to the Marques Scipione of Santa Cruz, Prince of Oliveto, three congratulating on his appointment as Grandee of Spain ( three pages , March 1718), one signed by the Marquis de la Paz, written on behalf of the Infante Don Carlos and confirming the aristocratic title, one page , Madrid, 30 October 1728; another one, signed Santiago Monzoro, says the King of Spain confirms the appointment, one page , 14 September 1789; and one expressing best wishes to Santa Cruz on behalf of the King, one page , 26 November (?) 1792; restoration, age-related soiling, some with humidity stains, folios (6); a letter to an unknown recipient, in Spanish, from Dona Maria Ana of Austria, natural daughter of Don Juan of Spain, one page, integral blank, some losses with restoration to right margin, folio , Malaga, 2 March 1621. (8)