Short answers, pulled from the story.
The Great Adventure of Horus Prince of the Sun was released in 1968 and received a mere ten-day theatrical run. This short duration was a decision by Toei executives that many historians believe was a punitive measure against union organizers who fought for better working conditions at the studio.
The Great Adventure of Horus Prince of the Sun was directed by Isao Takahata and featured the first major collaboration between Takahata and Hayao Miyazaki. The core production team also included animation director Yasuo Otsuka, Yasuji Mori, Reiko Okuyama, and Yoichi Kotabe.
The Great Adventure of Horus Prince of the Sun unfolds in an unspecified northern kingdom in ancient Norway and follows a young boy named Horus who seeks to avenge his village. Horus must defeat the ice devil Grunwald and his silver wolves while uniting villagers to reforge the Sword of the Sun.
The Great Adventure of Horus Prince of the Sun marked the beginning of a 50-year partnership between Isao Takahata and Hayao Miyazaki that would define the next half-century of anime history. The film introduced complex character designs and socialist ideals that established new standards for character complexity and collective effort in animation.
Discotek Media released The Great Adventure of Horus Prince of the Sun on DVD for Northern America on the 23rd of December 2014 and on Blu-ray Disc on the 28th of March 2017. These releases included new English-language subtitles and audio options that were not present on previous versions.