The first and foremost example that comes to my mind is the Divine Comedy by Dante Alighieri, written in the early XIV century.
This poem, a work of paramount importance for both Italian and World literature, is famously composed of three books, or cantiche:
A famous novel trilogy is Alexandre Dumas' story about D'Artagnan, Porthos, Athos and Aramis:
The Three Musketeers in 1844
Twenty Years After in 1845
The Vicomte of Bragelonne in 1847-1850
I won't pretend it is the oldest one, but it may well be the most read trilogy ever.
Walter Scott's work Kenilworth, 1821, is an early example of the form called three-volume novel.
James Fenimore Cooper published the first three of his Leatherstocking Tales between 1823 and 1827, with more volumes arriving in the 1840s.
Note that for novel sequences in general, "There is no useful, formal demarcation between novel sequences and multi-part ...
Wikipedia has a category Literary trilogies. The oldest novels in the list seem to date from central Europe: Henryk Sienkiewicz's Trilogy (1884-1888), Alois Jirásek's Mezi proudy (1891-1909), and Jerzy Żuławski's Lunar Trilogy (1901-1911). I have no idea whether this reflects a bias in Wikipedia contributors or is historically accurate. The oldest listed in ...
Robert Folkestone Williams wrote a trilogy of novels about William Shakespeare:
1838: The Youth of Shakespeare,
1839: Shakespeare and his Friends,
1844: Secret Passion.
At around the same time, Edgar Allen Poe wrote three short stories with C. Auguste Dupin, an amateur detective, as the main character:
1841: The Murders in the Rue Morgue,
Has any music act ever topped the Beatles in sales?
There is probably only one likely contender - Elvis Presley - but it is highly unlikely that we'll ever know for sure.
There are numerous problems in arriving at a total, not least of which is how sales of albums and singles are counted. Should one album sale be equivalent to one single ...
I am not at all sure it was that long ago that interest in social dancing waned. I am curious why singles dances weren't even mentioned here as I was very active in that scene for many years. I eventually stopped going to them because more of the women who attended were the type who felt that if you weren't Prince Charming you weren't worth a few minutes on ...
I know of three novels by Jules Verne that might or might not fit the definition of a trilogy.
Les Enfants du Capitaine Grant (The Children of Captain Grant) 1868, three volumes. Involves the search for the missing sea captain Grant.
Vingt Mille Lieues sous les mers (20,000 Leagues Under the Sea) 1870. 2 volumes. Captain Nemo and his submarine Nautilus.