Year 1513 (MDXIII) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar.

Piri Reis (full name Hacı Ahmed Muhiddin Piri - Hadji Ahmed Muhiddin Piri, Ahmet ibn-i el-Haç Mehmet El Karamani; Reis was a Turkish military rank akin to that of captain) was an Ottoman admiral, geographer and cartographer born between 1465 and 1470 and died in 1554 or 1555.

He is primarily known today for his maps and charts collected in his Kitab-ı Bahriye (Book of Navigation), a book that contains detailed information on navigation, as well as very accurate charts (for its time) describing the important ports and cities of the Mediterranean Sea. He gained fame as a cartographer when a small part of his first world map (prepared in 1513) was discovered in 1929 at the Topkapı Palace in Istanbul. His world map is the oldest known Turkish atlas showing the New World, and one of the oldest maps of America still in existence anywhere (the oldest known map of America that is still in existence is the map drawn by Juan de la Cosa in 1500). Piri Reis' map is centered on the Sahara at the latitude of the Tropic of Cancer.

Robert Joseph "Bob" Vila (b. June 20, 1946) is an American home improvement television show host known for This Old House (1979–1989), Bob Vila's Home Again (1990–2005), and Bob Vila (2005–2007).

Vila, a Cuban American native of Miami, Florida, received a Bachelor degree in entomology from the University of Florida in 1969. After graduating, he served as a volunteer in the Peace Corps, working in Panama from 1971 to 1973.

Vila was hired as the host of This Old House in 1979 after receiving the "Heritage House of 1978" award by Better Homes and Gardens, for his restoration of a Victorian Italianate house in Newton, Massachusetts. On This Old House, Vila appeared with carpenter Norm Abram as they, and others, renovated houses. In 1989 he left the show under controversial circumstances. Some cite the reason as being a series of conflicts with This Old House executive producer Russell Morash arising from his involvement with outside commercial endorsements, while others cite a specific instance- Vila's commercial work for New Jersey-based Rickel and the subsequent retaliatory pulling of underwriting from Rickel's competitor Home Depot and lumber supplier Weyerhaeuser- as the reason behind his departure. He was replaced by Steve Thomas.

Niccolò di Bernardo dei Machiavelli (Italian pronunciation: [nikkoˌlɔ makjaˈvɛlli], 3 May 1469 – 21 June 1527) was an Italian historian, diplomat, philosopher, humanist and writer based in Florence during the Renaissance. A founder of modern political science, he was a diplomat, political philosopher, playwright, and a civil servant of the Florentine Republic. He also wrote comedies, carnival songs, and poetry. His personal correspondence is renowned in the Italian language. He was Secretary to the Second Chancery of the Republic of Florence from 1498 to 1512, when the Medici were out of power. He wrote his masterpiece, The Prince after the Medici had recovered power and he no longer held a position of responsibility in Florence, and is respectively interpreted by many as a satire of these powers.

Machiavelli was born in Florence, Italy, the first son and third child of attorney, Bernardo di Niccolò Machiavelli, and his wife, Bartolomea di Stefano Nelli. The Machiavelli family are believed to be descended from the old marquesses of Tuscany and to have produced thirteen Florentine Gonfalonieres of Justice, one of the offices of a group of nine citizens selected by drawing lots every two months, who formed the government, or Signoria. Machiavelli, like many people of Florence, was however not a full citizen of Florence, due to the nature of Florentine citizenship in that time, even under the republican regime.