How did the BGB come into being?

The civil law (Romano-Germanic) family: the world's largest legal family — the systems descending from Roman law through the medieval universities, the canon-law partnership, and the great national codifications — characterized by: the code as law's primary monument; statuteas the dominant source (case law persuasive, not formally binding); the deductive method (from code-articles to judgment); the inquisitorial procedure tradition; the career judiciary; and the scholarly doctrine (the professors' law — doctrina) as the system's hidden source. Its spread: Europe (the continental west; the Nordic near-family), Latin America, most of Africa's and Asia's codified states, Russia's and China's borrowed layers — and Nepal's own Ain-code tradition as a distant cousin by method.Development's arc: Roman law (below) → the medieval revival (Bologna, c. 1088 — Irnerius teaching the Corpus Juris Civilis; the glossators and commentators; the commune's pan-European jus commune) → the reception in Germany (Rezeption — Roman law received as subsidiary law in the Empire's courts) → the natural-law codification era (the Enlightenment's codes: Prussia's Allgemeines Landrecht 1794; the French Code Civil 1804; the Austrian ABGB 1811) → the pandectist nineteenth century (the German historical school — Savigny's Volksgeist and the anti- codification debate; the pandectists' systematization bearing the BGB 1896/1900) → the twentieth century's export (the codes of the decolonized world; the Italian 1942 codice; the EU-law era's new acquis)…