The procuratorship of Hispania Tarraconensis was next. A statement by Pliny the Younger that his uncle was offered 400,000 "sesterces" for his manuscripts by Larcius Licinius while he (Pliny the Elder) was procurator of Hispania makes it the most certain of the three. Pliny lists the peoples of "Hither Hispania", including population statistics and civic rights (modern Asturias and Gallaecia). He stops short of mentioning them all for fear of "wearying the reader". As this is the only geographic region for which he gives this information, Syme hypothesizes that Pliny contributed to the census of Hither Hispania conducted in 73/74 by Vibius Crispus, legate from the Emperor, thus dating Pliny's procuratorship there. During his stay in Hispania, he became familiar with the agriculture and especially the gold mines of the north and west of the country. His descriptions of the various methods of mining appear to be eyewitness judging by the discussion of gold mining methods in his "Natural History." He might have visited the mine excavated at Las Médulas. The last position of procurator, an uncertain one, was of Gallia Belgica, based on Pliny's familiarity with it. The capital of the province was Augusta Treverorum (Trier), named for the Treveri surrounding it. Pliny says that in "the year but one before this" a severe winter killed the first crops planted by the Treviri; they sowed again in March and had "a most abundant harvest." The problem is to identify "this", the year in which the passage was written. Using 77 as the date of composition Syme arrives at AD 74-75 as the date of the procuratorship, when Pliny is presumed to have witnessed these events. The argument is based entirely on presumptions; nevertheless, this date is required to achieve Suetonius' continuity of procuratorships, if the one in Gallia Belgica occurred. Pliny was allowed home (Rome) at some time in AD 75–76. He was presumably at home for the first official release of "Natural History" in 77. Whether he was in Rome for the dedication of Vespasian's Temple of Peace in the Forum in 75, which was in essence a museum for display of art works plundered by Nero and formerly adorning the Domus Aurea, is uncertain, as is his possible command of the "vigiles" (night watchmen), a lesser post.