For 10 points, name this notorious governor-general of the Spanish Netherlands.
One journey undertaken by this figure was commemorated in another man's poem describing how the "streams/ran soundlessly under bridges of glass/and through frozen channels underground." This man's son had to retreat during the Siege of Alkmaar. This close friend of poet Garcilaso de la Vega died soon after commanding a victorious army at Alcantara during a war in Portugal. He had earlier led his monarch's forces at the Battle of Muhlberg which effectively destroyed the Schmalkaldic League. Prior to being disgraced due to his son's love affair with Garcia de Toledo's daughter, this man imposed an unpopular 10% sales tax and had the Counts of Egmont and Hoorn killed under the Council of Blood as part of Philip II's orders to keep a certain Protestant Low Country in line. For 10 points, name this notorious governor-general of the Spanish Netherlands.
One journey undertaken by this figure was commemorated in another man's poem describing how the "streams/ran soundlessly under bridges of glass/and through frozen channels underground.
Don Fernando Álvarez de Toledo y Pimentel, 3rd Duke of Alba [accept either underlined; or the Iron Duke]