Question: In what time period was the prequel to "Fate/stay night" named a best anime series?

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Fate/kaleid liner Prisma Illya: Fate/kaleid liner Prisma Illya (Fate/kaleid liner プリズマ☆イリヤ , Fate/kaleid liner purizuma iriya ) is a manga series by Hiroshi Hiroyama (also known as KALMIA), serialized in Kadokawa Shoten's "Comp Ace" magazine from 2007 to 2008.  It is an alternate universe spin-off of the "Fate/stay night" visual novel by Type-Moon, with Illyasviel von Einzbern as the protagonist.  Various other characters from "Fate/stay night" and its sequels and spin-offs also appear.  A sequel series titled "Fate/Kaleid liner Prisma Illya 2wei! " (Fate/kaleid liner プリズマ☆イリヤ ツヴァイ！ ) was serialized from 2009 to 2012.  A third manga series titled "Fate/Kaleid liner Prisma Illya 3rei!!"  (Fate/kaleid liner プリズマ☆イリヤ ドライ！！ ) began serialization in 2012.

Fate/stay night: Fate/stay night (Japanese: フェイト/ステイナイト , Hepburn: Feito/Sutei Naito ) is a Japanese visual novel developed by Type-Moon, which was originally released as an adult game for Windows.  A version of "Fate/stay night" rated for ages 15 and up titled "Fate/stay night Réalta Nua" (Irish for "new stars"), which features the Japanese voice actors from the anime series, was released for the PlayStation 2 and later for download on Windows as a trilogy covering the three main story lines.  "Réalta Nua" is also ported to the PlayStation Vita.  On October 28, 2005, Type-Moon released a sequel to "Fate/stay night", titled "Fate/hollow ataraxia".  Its plot is set half a year after the events of "Fate/stay night".

List of Fate/kaleid liner Prisma Illya episodes: "Fate/kaleid liner Prisma Illya" is a 2013 anime series by Silver Link based on the manga by Hiroshi Hiroyama, which is itself a spin-off of Type-Moon's visual novel, "Fate/stay night".  Set in an alternate universe to "Fate/stay night" and its prequel, "Fate/Zero", the series follows Illyasviel von Einzbern, aka Illya, who reluctantly becomes a magical girl tasked with capturing magical cards scattered across the city.

Fate/kaleid liner Prisma Illya 2wei: Fate/kaleid liner Prisma Illya 2wei (Fate/kaleid liner プリズマ☆イリヤ ツヴァイ！ ) is the second season of the "Fate/kaleid liner Prisma Illya" anime series.  The episodes were directed by Shin Oonuma and Masato Jinbo and animated by Silver Link.  The season is based on the first half of Hiroshi Hiroyama's "Fate/kaleid liner Prisma Illya 2wei" manga series, which is the second series of the "Prisma Illya" manga; an alternate universe spin-off of Type-Moon's visual novel "Fate/stay night" in which the events of the Fourth Holy Grail War from "Fate/Zero" never occurred and Illya lived a normal life.  The plot of this season focuses on the arrival of Illya's "clone" Kuro, Illya learning more about her past as well as her role in the Holy Grail War and finding the rest of the Class Cards.

Fate/stay night: Heaven's Feel: Fate/stay night: Heaven's Feel (Japanese: 劇場版「Fate/stay night[Heaven’s Feel]」 , Hepburn: Gekijō-ban Fate/stay night: Heaven's Feel ) is an upcoming trilogy of Japanese anime films produced by Ufotable, directed by Tomonori Sudō, written by Akira Hiyama and featuring music by Yuki Kajiura.  The trilogy will follow "Heaven's Feel", the third and final route of the visual novel.  The main heroine is Sakura Matou and the trilogy is focused on the human characters: Shirou, Rin, Sakura and Illya, how they relate to the previous Holy Grail War and the true nature of the Grail itself.  The first film, titled "Fate/stay night: Heaven's Feel I. presage flower", is scheduled to premiere on October 14, 2017.

Saber (Fate/stay night): Saber (セイバー , Seibā ) is a fictional character from the Japanese visual novel and anime series "Fate/stay night" by Type-Moon and its prequel, "Fate/Zero", by Type-Moon and nitroplus.  In "Fate/stay night", she is Shirou Emiya's servant while in "Fate/Zero", she is Kiritsugu Emiya's Servant.  An agile and powerful warrior, Saber is loyal, independent, and reserved; she appears cold, but is actually suppressing her emotions to focus on her goals.  Her class is considered the "Most Outstanding", with excellent ratings in all categories.

2012 in anime: In Japanese polling, "Newtype"' s best releases of Autumn 2011 to Summer 2012 announced the best anime series as "Fate/Zero", "The Idolmaster", "Nisemonogatari", "Tari Tari" and "Hyouka".  For movies, the poll named only three awards for the "K-On!  Movie", "Mahou Shoujo Lyrical Nanoha: The Movie" and "Wolf Children".  Another series debut was "Sword Art Online".  Kotaku's Richard Eisenbeis praised "Sword Art Online", even before the series conclusion, for its complex and genre-crossing storyline and intelligent portrayal of sociological and psychological issues.  Eisenbeis would also pick five different movies for top film of 2012, including "The Wolf Children Ame and Yuki", "Evangelion 3.0", "", "" and "" as his top five movies.

Fate/Zero: Fate/Zero (Japanese: フェイト/ゼロ , Hepburn: Feito/Zero ) is a Japanese light novel written by Gen Urobuchi, illustrated by Takashi Takeuchi, and is a prequel to all routes in Type-Moon's visual novel, "Fate/stay night".  "Fate/Zero" is set ten years before the events of "Fate/stay night", and tells the story of the Fourth Holy Grail War, a secret magical tournament held in Fuyuki City, Japan where seven magicians known as Masters summon Servants, reincarnations of legendary souls and heroes from all across time, where they fight in a deadly battle royale where the winner obtains the Holy Grail, a magical legendary chalice capable of granting wishes.  The main protagonist, Kiritsugu Emiya, the foster father of "Fate/stay night"'s protagonist, Shirō Emiya, is known as a merciless mage killer who joins the tournament on behalf of his wife's family, the Einzberns.

List of Fate/stay night episodes: The "Fate/stay night" anime is based on the visual novel "Fate/stay night" by Type-Moon.  The episodes are directed by Yuji Yamaguchi, animated by Studio Deen and produced by the Fate Project, which included Geneon Entertainment, TBS, CREi, Type-Moon and Frontier Works Inc.  The plot of the episodes is primarily based on the "Fate" storyline in the "Fate/stay night" visual novel, although certain elements of the other two storylines, "Unlimited Blade Works" and "Heaven's Feel", are incorporated into the plot.

Fate/stay night: Unlimited Blade Works: Fate/stay night: Unlimited Blade Works (officially "Fate/stay night [Unlimited Blade Works]" ) is a 2014–2015 action, thriller, fantasy anime based on the visual novel "Fate/stay night" produced by Type-Moon.  The plot of the episodes is primarily based on the "Unlimited Blade Works" storyline in the "Fate/stay night" visual novel, in which Shirō Emiya, a high school student and amateur magus living in Fuyuki City, Japan, is dragged into the Fifth Holy Grail War, a secret magical tournament.  In it, seven participants, known as "Masters", and their "Servants", reincarnated personifications of legendary heroes of history, fight in a battle royale for the Holy Grail, an omnipotent magical chalice that can fulfill any wish or desire for its victor.  Shirō and his Servant, Saber, are forced to team up with Rin Tōsaka, another Master in the Holy Grail War, but Shirō finds himself earning the strong dislike of Rin's mysterious Servant, Archer, whose motivations are unknown.

Supporting paragraphs: 2012 in anime Fate/Zero
Answer: Autumn 2011 to Summer 2012