de todos os

listen to the pronunciation of de todos os
Португальский Язык - Английский Язык
of all

I like May the best of all the months. - De todos os meses, maio é o que eu mais gosto.

Poverty is the mother of all vices. - A pobreza é a mãe de todos os vícios.

Used as an intensifier with nouns to denote being ultimate
Used as an intensifier with superlative forms of adjectives

He was the greatest playwright of all.

See: 'of all people'