" Crossings ," the 16th episode of Vikings season 4, serves as the series' critical transition following the death of its central figure, Ragnar Lothbrok. First aired on , and written by series creator Michael Hirst, the episode focuses on the immediate aftermath of Ragnar’s execution and how his legacy begins to drive the next generation of Norse leaders. Narrative Highlights and Key Events

Bjorn Ironside and his fleet—including Rollo, Floki, and Hvitserk—arrive in Muslim-ruled Algeciras, Spain. This raid is historically significant as it marks the furthest the Vikings have traveled, surpassing even Ragnar's ambitions.

During the raid, Floki enters a mosque and is profoundly moved by the devotion of the Muslims praying inside. In a rare act of mercy, he prevents his fellow Vikings from slaughtering the worshipers, reflecting a shifting inner perspective.

Seeking clarity, Lagertha visits The Seer , who confirms that she will eventually be killed by one of Ragnar’s sons.