the colour of deepest mourning among medieval European queens was white.
Widows were expected to wear special clothes to indicate that they were in mourning for up to four years after the death, although a widow could choose to wear such attire for the rest of her life. To change the costume earlier was considered disrespectful to the decedent and, if the widow was still young and attractive, suggestive of potential sexual promiscuity. Those subject to the rules were slowly allowed to re-introduce conventional clothing at specific time periods; such stages were known by such terms as “full mourning”, “half mourning”, and similar descriptions. At half mourning, gray and lavender could be introduced.
White is also associated with peace. The white ribbon is worn by movements denouncing violence against women and the White Rose was a non-violent resistance group in Nazi Germany. This symbolism has long roots as seen by the white dove originating from the story of Noah. A white flag is an international sign of either surrender, or truce, that is, it is a sign of peaceful intent, typically at time of war.