Question: What is the date of death of the author of Matecumbe?

Context articles: Matecumbe (novel)
April Fool's Day (novel)
James A. Michener
Kumara Varma
Albert Touchard
History of Purgatory
Copyright expiration in Australia
Euphorion (playwright)
Eliza Rennie
Tovma Artsruni

Matecumbe (2007) is a novel by American author James A. Michener, published unfinished, posthumously.
April Fool's Day is a 1993 book by Australian author Bryce Courtenay.
 The book is a tribute to the author's son, Damon Courtenay, a haemophiliac who contracted HIV/AIDS through an infected blood transfusion.
 The title refers to the date of Damon's death, 1 April 1991 (April Fools' Day).
James Albert Michener ( ; February 3, 1907 – October 16, 1997) was an American author of more than 40 books, most of which were fictional, lengthy family sagas covering the lives of many generations in particular geographic locales and incorporating solid history.
 Michener was known for the popularity of his works; he had numerous bestsellers and works selected for Book of the Month Club.
 He was also known for his meticulous research behind the books.
Kumara Varma (born April 1945) is an Indian theatre director.
 To date, he has directed at least thirty-six Indian and Western plays during the past five decades, including "Raja Oedipus", "Urubhangam", "Mattavilasam", "Abhijnana Shakuntalam", "Ashadh Ka Ek Din", "Baaki Itihas", "Uddhwast Dharmashala", "Six Characters in Search of an Author", "Death Watch", "Agg De Kaleere" ("Blood Wedding") and "Leedli Nagari ki Neeti Katha" ("The Visit").
Albert Camille Touchard (Paris 7 February 1876 - date of death unknown, but between 1935 and 1945) was a French author.
 He is best remembered as author of "La Guêpe" (1934) which won Grand Prix du roman de l'Académie française in 1935.
The idea of purgatory has roots that date back into antiquity.
 A sort of proto-purgatory called the "celestial Hades" appears in the writings of Plato and Heraclides Ponticus and in many other pagan writers.
 This concept is distinguished from the Hades of the underworld described in the works of Homer and Hesiod.
 In contrast, the celestial Hades was understood as an intermediary place where souls spent an undetermined time after death before either moving on to a higher level of existence or being reincarnated back on earth.
 Its exact location varied from author to author.
 Heraclides of Pontus thought it was in the Milky Way; the Academicians, the Stoics, Cicero, Virgil, Plutarch, the Hermetical writings situated it between the Moon and the Earth or around the Moon; while Numenius and the Latin Neoplatonists thought it was located between the sphere of the fixed stars and the Earth.
Copyright expiration in Australia depends on when a work was created, and on the type of work.
 Under the current law, copyright usually expires 70 years after the death of the author, or for anonymous works, 70 years from the date of publication.
 Crown copyright expires 50 years after publication.
 The law has evolved over the years, and previously photographs were treated differently from other works.
 Anonymous works and photographs created before 1955 are no longer under copyright.
 For non-photographic works created before 1955, where the author is known, the copyright expires 50 years after the death of the author.
Euphorion (Greek: Εὐφορίων , "Euphoríōn") was the son of the Greek tragedian Aeschylus, and himself an author of tragedies.
 In the Dionysia of 431 BCE, Euphorion won 1st prize, defeating both Sophocles (who took 2nd prize) and Euripides, who took 3rd prize with a tetralogy that includes the extant play "Medea".
 He is purported by some to have been the author of "Prometheus Bound"—previously assumed to be the work of his father, to whom it was attributed at the Library of Alexandria,—for several reasons, chiefly that the playwright's portrayal of Zeus is far less reverent than in other works attributed to Aeschylus, and that references to the play appear in the plays of the comic Aristophanes.
 This has led historians to date it as late as 415 BCE, long after Aeschylus's death.
 If Euphorion wrote "Prometheus Bound", there are as a result five ancient Greek tragedians with one or more fully surviving plays: Aeschylus, Euphorion, Sophocles, Euripides, and the unknown author of the tragedy Rhesus.
Eliza Rennie or Mrs. Eliza Walker is a published author, though her biography remains somewhat of a mystery.
 She was possibly born 17 May 1813, although this is uncertain and unproven.
 Her death date was sometime after 30 Mar 1869, when she was awarded £25 by the Royal Literary Fund.
 Eliza was a minor Scottish-born romantic/gothic short story author, who spent most of her adult life in London, and published an autobiographical two-volume work of literary gossip "Traits of Character: being Twenty-Five Years' Literary and Personal Recollections, by a Contemporary".
 She was most notable for writing about her friendship with Mary Shelley and her contemporaries, including meetings with such celebrities as the Duke of Wellington.
Tovma Artsruni (Armenian: Թովմա Արծրունի ; also known in English-language historiography as Thomas Artsruni; precise birth date and date of death unknown) was a ninth-century to tenth-century Armenian historian and author of the "History of the House of Artsrunik" (Armenian: Պատմություն Արծրունյաց Տան ).
 Contrary to the given title, the four-volume work not only relates the history of Artsruni royal family, of which he was a member of, and its origins near Lake Van but also comprehensively covers the history of Armenia.