Relevant crashcourse filmpje
https://www.youtube.com/watch?v=etmRI2_9Q_A
Ted talk filmpje over de origines van Rusland
https://www.youtube.com/watch?v=lfe1wEQzSzM
Het zeer gruwelijke verhaal van Olga van Kiev
https://www.historyanswers.co.uk/medieval-renaissance/olga-of-kiev-one-saint-you-do-not-want-to-mess-with/