Juan Fernández de Velasco y Tovar, 5th Duke of Frías

Juan Fernández de Velasco, 5th Duke of Frías (c. 1550 – 15 March 1613) was a Spanish nobleman and diplomat.

Biography
Juan Fernández de Velasco was the son of Íñigo Fernández de Velasco; and of Maria Angela de Aragón y Guzmán El Bueno. He inherited his father's title of Constable of Castile, and was present at the signing of the Treaty of London (1604).

London in 1604
He was sent to London to sign the recently negotiated peace treaty. The resident Spanish ambassador, the Count of Villamediana, asked King James if Velasco could be lodged at Somerset House, and Anne of Denmark granted his request. The lodging was decorated with royal tapestries, and his bedchamber furnished with a bed of "morado damask" bordered with gold. Velasco arrived in London on 10 August 1604.

He came to Somerset House on a barge on the Thames. His arrival was managed by the Earl of Northampton., and watched by spectators in boats and barges near the Tower of London, including Anne of Denmark, the Countess of Suffolk, the Earl of Nottingham, and Robert Cecil. The queen and her companions wore black masks and their barge was disguised, without royal insignia.

The Constable saw King James on 15/25 August and had an audience with Anne of Denmark three days later at Whitehall Palace, and he watched Prince Henry dance and exercise with a pike in the garden. He gave the prince a pony. Prince Henry danced for the guests. The Constable gave Prince Henry a Spanish horse with a rich saddle and bridle and an embroidered doublet with a sash. He signed the treaty in the chapel royal at Whitehall on 19 August. Afterwards at a banquet, he gave Anne of Denmark a cup of crystal garnished with gold, shaped like a dragon. From the windows, the party watched greyhounds and mastiffs fight bears. King James gave him a service of vintage gilt plate, and Anne of Denmark gave him a jewelled locket with miniature portraits, supplied by John Spilman for £1000, with a stomacher or necklace (garganto) set with pearls for his wife. He left England from Dover.

Details of embassy are known from letters of the Earl of Northampton, and the Spanish Relación de la Jornada del Condestable de Castilla published in Antwerp 1604.

Governor of Milan
Juan Fernández de Velasco was Governor of the Duchy of Milan in the period 1592–1600 and 1610–1612. In 1595, he led the Spanish forces in the Battle of Fontaine-Française against the French, where he let victory slip through his fingers, due to excessive caution.

Descendants
Around 1580, the Duke married María Girón de Guzmán, eldest daughter of Pedro Girón de la Cueva, 1st Duke of Osuna. Together they had a son and a daughter. The daughter, Ana de Velasco y Girón in turn married Teodósio II, Duke of Braganza and in 1604 gave birth to João, 8th Duke of Bragança, who was crowned King João IV of Portugal on 1 December 1640. In 1608, after the death of his first wife, Juan Fernández de Velasco married Joana de Córdoba y Aragón, and together they had three children:

By María Girón de Guzmán:
 * Íñigo Fernández de Velasco, 9th Count of Haro
 * Ana de Velasco y Girón, married Teodósio II, Duke of Braganza being the mother of King John IV of Portugal

By Joana de Córdoba y Aragón:
 * Bernardino Fernández de Velasco, 6th Duke of Frías, married Isabel Maria de Guzmán
 * Luis de Velasco, 1st Marquis del Fresno, married Catarina de Velasco
 * Mariana Fernandez de Velasco, deceased 1650, married António II Alvarez de Toledo, 7th Duke of Alba, 4th Duke of Huéscar, a Knight of the Order of the Golden Fleece since 1675, (1615–1690).