Short answers, pulled from the story.
The first known phonetic changes in the Portuguese language began before the Roman Empire arrived, initiated by ancient Celtic tribes inhabiting the Iberian Peninsula. These changes evolved under the influence of local Celtic dialects and resulted in the unique nasal vowels that distinguish Portuguese from other Romance languages.
Approximately 500 Germanic words entered the Portuguese lexicon after the Roman Empire crumbled between 409 and 711 AD, primarily related to warfare, the natural world, and human emotions. Words like espada meaning sword and guarda meaning guard are direct descendants of Gothic and Suebian roots.
King Denis of Portugal established the first Portuguese university in Lisbon and decreed that the common language be officially known as the Portuguese language in 1290. This royal decree marked the end of the Proto-Portuguese phase and the beginning of a standardized literary tradition.
The Portuguese language reached as far as the Pacific Ocean during the 15th century expansion, establishing communities in India, Sri Lanka, Malaysia, and Indonesia. It became a lingua franca in Asia and Africa by the mid-16th century, used for colonial administration and trade.
Today, the Portuguese language exists in two primary standardized varieties: European Portuguese and Brazilian Portuguese. European Portuguese is based on the speech of Coimbra and Lisbon, while Brazilian Portuguese dominates the most populous Lusophone nation.
Portuguese grammar preserves more verbal inflections from classical Latin than any other major Romance language, retaining features that have disappeared elsewhere. It is the only Romance language that preserves the clitic case mesoclisis and maintains the future subjunctive mood.