1041

Yaroslav attacked the Mazovians by boat

• Russo-Byzantine War, military expedition against Constantinople ended in disastrous defeat. The legendary saga Yngvars saga víðförla describes the last expedition of the Vikings into the Caspian, dated to 1041 and possibly connected with the Georgian-Byzantine Battle of Sasireti in which a Varangian force participated around the same time; in the saga much legend is conflated with the historical facts. This expedition was launched from Sweden by Ingvar the Far-Travelled, who went down the Volga into the land of the Saracens (Serkland in Norse). There are no less than twenty-six Ingvar Runestones, twenty-three of them being in the Lake Mälaren region of Uppland in Sweden, referring to Swedish warriors who went out with Ingvar on his expedition to the Saracen lands, an expedition whose purpose was probably to reopen old trade routes, now that the Bulgars and the Khazars no longer proved obstacles. A stone to Ingvar's brother indicates that he went east for gold but that he died in the Saracen land. Afterwards, no attempts were made by the Norsemen to reopen the route between the Baltic and Caspian seas

• The Caspian expeditions of the Rus' were military raids undertaken by the Rus' between 864 and 1041 on the Caspian Sea shores.

• 1038-1041 Yaroslav waged campaigns against the Lithuanian Yatvingians, Mazovia

• 1030-1061 Estonia, as Yaroslav the Wise of Novgorod and Kiev raids the Estonian fortress of Tarbatu and founds a fort named Yuryev. Occupied until 1061

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