In general, colonias (Spanish pronunciation:[koˈlonjas]) are neighborhoods in Mexican cities, which have no jurisdictional autonomy or representation. It is plausible that the name, which literally means colony, arose in the late 19th, early 20th centuries, when one of the first urban developments outside Mexico City's core was inhabited by a French colony in the city. Usually colonias are assigned a specific postal code; nonetheless, in recent urban developments, gated communities are also defined as colonias and share the postal code with adjacent neighborhoods. In spite of this, the name of the colonia must be specified when writing an address in large urban areas in Mexico.
Set in 1973, a young couple become entangled in a Chilean military coup at a time when there is much protest on the streets against General Augusto Pinochet. When Daniel is abducted by Pinochet's secret police DINA, Lena tries to find and save her husband. She tracks him to a sealed-off village called "Colonia Dignidad", which presents itself as a charitable mission run by a lay preacher, Paul Schäfer, but is in fact a place from which no one has ever escaped. Lena decides to join the cult to attempt to rescue her husband.
Years after leaving UNIT, Jo Grant receives a plea for help from an old acquaintance. A paleontological study of the earliest known humans is apparently under threat from a UNIT force led by a captain who does not officially exist. Investigating further, she begins to find herself out of her depth - and out of the twentieth century altogether...
Meanwhile, the Doctor and Sam visit Earth in 2109 - but there is no trace of the human race. Earth is the home of the Tractites, a peaceful race who have been living there for hundreds and thousands of years. Astonished and appalled, the Doctor travels back in time to see just what went wrong in Earth's pre-history.
Why have Jo and the expedition been taken back in time? Are the Tractites all they seem? Finally, separated from the TARDIS, the Doctor's last chance to put things right rests with Sam - but has even she turned against him?
Africa and De viris illustribus were partially inspired by Petrarch's visit to Rome in 1337. According to Bergin and Wilson (p. ix). It seems very likely that the inspirational vision of the Eternal City must have been the immediate spur to the design of the Africa and probably De viris illustribus as well. After returning from his grand tour, the first sections of Africa were written in the valley of Vaucluse. Petrarch recalls
The fact that he abandoned it early on is not entirely correct since it was far along when he received two invitations (from Rome and from Paris) in September 1340 each asking him to accept the crown as poet laureate. A preliminary form of the poem was completed in time for the laurel coronation April 8, 1341 (Easter Sunday).