Jesús de Polanco, the chairman and founder of Spanish media conglomerate Grupo Prisa, died July 21 in his home in Madrid. He was 77 years old.

De Polanco's media trajectory began in 1958, when he founded schoolbook publishing company Santillana, which would eventually expand to include Spanish daily El País, radio conglomerate Union Radio (whose holdings, in turn, include Cadena Ser, 40 Principales and stakes in Caracol Radio in Colombia and Radiópolis in Mexico, among others), sports daily AS, business newspaper Cinco Días and TV broadcaster Cuatro, among many others.

Prisa, which is Spain's largest media group, was listed on the stock market seven years ago. Earlier this year, de Polanco, who had been sick for a long time, designated his son Ignacio Polanco Moreno as chairman of Grupo Prisa.