Short answers, pulled from the story.
Hispania was the Roman name for the Iberian Peninsula. Under the Roman Republic it was divided into two provinces, Hispania Citerior and Hispania Ulterior, and by the 4th century it had been reorganized into nine provinces grouped into the Diocese of Hispania.
Roman armies first invaded the Iberian Peninsula in 218 BC. Full conquest was not achieved until 19 BC, when the emperor Augustus completed the subjugation of the remaining autonomous regions after the Cantabrian Wars.
Three Roman emperors were born in Hispania: Trajan, who reigned from 98 to 117; Hadrian, who reigned from 117 to 138; and Theodosius, who reigned from 379 to 395.
The origin of Hispania is unknown. Proposed sources include a Phoenician word possibly meaning land of rabbits or metals, the pre-Roman name for Seville (Hispalis), the Basque word ezpain meaning border or edge, and a legendary figure named Hispan mentioned by the historian Gnaeus Pompeius Trogus in the 1st century BC. No theory has been confirmed.
Hispania's harbors exported gold, tin, silver, lead, wool, wheat, olive oil, wine, fish, and garum, a fermented fish sauce. Gold mining was the dominant industry in the northwest, with major sites at Las Médulas in Spain and Casais in Ponte de Lima, Portugal.
Roman rule in Hispania collapsed gradually after four Germanic and Sarmatian tribes crossed the Rhine in 406 and entered Iberia in 409. Roman authority effectively ended in 472, when the Visigoths occupied Tarragona and took control of the remaining Roman-held territory.