The Holy Brotherhood was a militia created (refounded, in fact) by the Catholic Monarchs in Castile to restore peace in the countryside after the chaos of the Succession War (1474-1479). This was one of the reforms they made to reinforce their authority over their subjects, especially over the nobles. On the picture below you can observe the uniform the members of the Holy Brotherhood wore. As Kelly has explained today, there is a Spanish expression related to the Holy Brotherhood that we still use to refer to people doing things too late. We say "A buenas horas, mangas verdes". This expression comes from the green sleeves of the Holy Brotherhood members´ uniform. People started using this expression to refer to this police force arriving too late to the places where a crime had been committed. This expression could be similar to the English expression "Too little, too late".
There is another interesting expression in Dutch related to the Holy Brotherhood. As we´ll study in a few days, Holland belonged to the Hispanic Monarchy for more than hundred years. The Dutch don´t have a good opinion of the Hispanic rule in Holland, but they have preserved the expression "Heilige Hermandad" (Holy Brotherhood) to refer to the Police in a positive way.
These two examples show us how history is present in many situations of our ordinary life.