Frederick II Staufen grew up in southern Italy, where the inhabitants spoke Sicilian and Arabic. In addition to these languages, Frederick knew Latin, Greek and Hebrew well, and also spoke Provençal and Tuscan (these are southern French and Northern Italian languages – all the poets of Europe then wrote poetry in them). Apparently, Frederick also spoke French (he was allied with Philip Augustus – the king of Northern France). Frederick II learned the main language of his empire – German – only towards the end of his life, for he had hardly ever been to Germany before.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.