This book attempts to demonstrate the genesis of the Creole languages of São Tomé and Príncipe (Forró, Lungié, Angolar). These languages, considered to be mother tongues, are disappearing in the islands of the Gulf of Guinea, in contrast to a high level of Portuguese speakers. It begins by analysing the historical and linguistic context, together with theorising the process of emergence of these languages. São Tomé and Príncipe is considered a creole society, but it presents a low level of number of speakers of each of these creoles, presenting a great devaluation and loss over them. The initial point is to show how the construction of the São Toméan Creole society takes place, in several crucial points so that these Creole languages are devalued and marginalised by their speakers and to enable policies and awareness of the population, to deconstruct the paradigm that has been created in relation to these languages in opposition to the language of the coloniser that lasts until daily life.