IPA: /mɪˈdiːvəli/
KK: /mɪˈdivəli/
In a manner that relates to the Middle Ages, often characterized by the customs, culture, or style of that time period.
The castle was decorated medievally, with tapestries and suits of armor.
Medievally → It is formed from "medieval" (from Latin *medium aevum*, meaning the middle ages) and the suffix "-ly" (meaning in a manner of). The word "medievally" means in a manner characteristic of the middle ages.
Think of the term 'middle ages' ('medium aevum') to remember that 'medievally' refers to something done in the style or manner of that historical period.