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I am really curious what will happen with climate and especially with sea surface temperature if we replace inflow from cool Atlantic with warm tropical waters from Indian ocean. I don´t care about effects on historic events. This "alternate timeline" is completely same like this one. But if you want you can mention some effects on historic event too.
Just imagine that Iberia is completely connected with Africa (similarly as Iberia is connected with western Europe). Instead of there is large connection through Red sea into Indian ocean. Red sea is fully connected. Width on the both ends is around 150 - 200 km in areas where distance between Arabia and Africa is the shortest. So Red sea is actually massive strait (for comparison connection to the Atlantic is only 20 - 40 km wide). In addition there is large mountain chain running from southern Iberia through central/eastern France up to western Austria and northern Italy (eastern foothills are around 14 - 16° east). Peak elevation around axis of main ridge is 2000 - 4900 meters above sea level. This mountain chain includes real mountain chains like Alps, Pyrenees, Sierra Nevada etc. Thanks to this mountain chain Mediterranean sea is sheltered from airmasses of polar origin originated from Northern Atlantic. So Mediterranean sea is completely under influence of continentality of Euro-Asia land mass, Middle east and northern Africa.
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