http://book.klll.cc/ebooks/subject/36331.opds 2025-11-16T21:43:01Z Books about Frederick I, Holy Roman Emperor, approximately 1123-1190 Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-16T21:43:01Z https://book.klll.cc/ebooks/65142.opds Barbarossa Franz Kühn