My grandfather spoke over 10 languages, but some of them aren’t really that different.I seem to remember that Peter Czech could speak a language or two. Well it seems he can speak
Czech, English, French, German, Slovak, Spanish, and Italian. He can also speak basic Russian, Croatian, Serbian and Bosnian.
the demarcation between the Slavic languages is sometimes slightly forced. As they are more dialects at time than languages (polish being an exception). Using Russian he could speak to Serbs and they understood well what he meant.