Two sort of random thoughts.
1) OTL, the single greatest popularizer of Arabic numerals was Leonardo Fibonacci of Pisa. Leonardo was introduced to them while directing a Pisan trading post in Tunis.
TTL... well, I could see this going one of two ways. Either Norman Tunisia cuts down on the contact between Tunis and the northern Italians, thus slowing the spread of Arabic knowledge; or the Normans themselves fill the role, picking up Arabic numerals and such from their North African subjects, and spreading them just as fast or faster.
2) Thomas Aquinas! Assuming he's not butterflied away, TTL he'll grow up an a kingdom that's had a land border with Islam for around a century. Again, how this plays out depends on how you think Norman cultural elites would respond to longer and more intimate contact with Islam.
I note in passing that contemporary Castile was a hotbed of translation and intellectual ferment -- 13th century Castile was very different from what it became 250 years later. /If/ we assume the same forces work in the Three Sicilies, then Aquinas would be attending a University of Naples with a more noticeable Arabic flavor -- more and better translations from the classics, more annotations by Arabic scholars, possibly some direct correspondence with contemporary Islamic thinkers. (OTL there was some -- Emperor Frederick II encouraged it, since he was doing it himself -- but it was intermittent.)
My medieval philosophy-fu is not strong enough to guess the knock-ons, but... anyone?
Doug M.
1) OTL, the single greatest popularizer of Arabic numerals was Leonardo Fibonacci of Pisa. Leonardo was introduced to them while directing a Pisan trading post in Tunis.
TTL... well, I could see this going one of two ways. Either Norman Tunisia cuts down on the contact between Tunis and the northern Italians, thus slowing the spread of Arabic knowledge; or the Normans themselves fill the role, picking up Arabic numerals and such from their North African subjects, and spreading them just as fast or faster.
2) Thomas Aquinas! Assuming he's not butterflied away, TTL he'll grow up an a kingdom that's had a land border with Islam for around a century. Again, how this plays out depends on how you think Norman cultural elites would respond to longer and more intimate contact with Islam.
I note in passing that contemporary Castile was a hotbed of translation and intellectual ferment -- 13th century Castile was very different from what it became 250 years later. /If/ we assume the same forces work in the Three Sicilies, then Aquinas would be attending a University of Naples with a more noticeable Arabic flavor -- more and better translations from the classics, more annotations by Arabic scholars, possibly some direct correspondence with contemporary Islamic thinkers. (OTL there was some -- Emperor Frederick II encouraged it, since he was doing it himself -- but it was intermittent.)
My medieval philosophy-fu is not strong enough to guess the knock-ons, but... anyone?
Doug M.