
February 14, 842
A Linguistic Landmark in Medieval Europe
On February 14, 842, Charles the Bald and Louis the German, two grandsons of Charlemagne, took a historic step by swearing mutual oaths of allegiance against their brother, Lothair I. These Oaths of Strasbourg are among the earliest known written examples of both Old French and Old High German, making them a milestone in the evolution of European languages.
This event was more than just a political agreement—it was a linguistic watershed moment that reflected the shifting identities of medieval Europe, showcasing the emergence of distinct national languages from the once-unified Latin of the Carolingian Empire.
1. The Political Context: A Divided Empire and the Birth of Nations
The Oaths of Strasbourg were sworn in the aftermath of Charlemagne’s empire fracturing due to the competing ambitions of his grandsons. Following the death of their father, Louis the Pious (r. 814–840), the empire was divided among:
- Lothair I, the eldest, who claimed supremacy as emperor.
- Louis the German, who ruled East Francia (roughly modern Germany).
- Charles the Bald, who controlled West Francia (modern France).
Lothair sought to dominate his brothers, but in 842, Charles and Louis allied against him, formalizing their unity through the Oaths of Strasbourg.
What makes this event unique is not just the political maneuvering but the languages in which the oaths were sworn. To ensure their respective soldiers understood their commitments, Louis took his oath in Old French, while Charles took his in Old High German.
This decision highlights the growing linguistic divisions within the former Carolingian Empire, marking the separation of Romance and Germanic linguistic traditions.
2. The Linguistic Significance: The Birth of French and German as Written Languages
The Oaths of Strasbourg are one of the first known texts written in the emerging languages of Old French and Old High German—both of which had evolved from Vulgar Latin and early Germanic dialects.
- Old French (Romance language): Spoken in West Francia (modern France), it was evolving from Latin but had already developed distinct phonetic and grammatical structures.
- Old High German (Germanic language): Spoken in East Francia (modern Germany, Austria, and Switzerland), it had diverged significantly from Latin and was part of the wider Germanic linguistic family.
This bilingual oath underscores how Latin was no longer the sole language of administration, signaling the emergence of national identities tied to language.
Key Linguistic Observations from the Oaths
- Shift from Latin to Vernacular: The fact that rulers needed to address their troops in spoken languages rather than Latin shows that Latin was already losing its dominance in everyday speech.
- Distinct Grammatical and Phonetic Features: The Old French text shows clear differences from Latin, including simplified verb conjugations and loss of Latin cases.
- Political Legitimacy and Language: The oaths were designed for mutual understanding, emphasizing how language was becoming a political tool to rally support and express loyalty.
The Oaths of Strasbourg mark an early moment of French and German as distinct written languages, shaping their literary and historical development.
3. Key Phrases and Lasting Linguistic Impact
Many words and phrases from Old French and Old High German in the oaths laid the foundation for modern French and German vocabulary. Some notable elements include:
- Old French:
- “Pro Deo amur et pro Christian poblo et nostro commun salvament…”
- (“For the love of God and for the Christian people and our common salvation…”)
- Shows the development of “amur” (love), “poblo” (people, from Latin “populus”), and “salvament” (salvation).
- Old High German:
- “In godes minna ind in thes christanes folches ind unser bedhero gehaltnissi…”
- (“In God’s love and for the Christian people and our common preservation…”)
- Shows early forms of German word structure, such as “minna” (love, later “Minne”), and the usage of inflected endings still present in modern German.
These early linguistic features demonstrate the linguistic divergence between Romance and Germanic languages.
4. The Oaths’ Broader Impact on European Language and Politics
The Oaths of Strasbourg were not only significant linguistically but also politically:
- They foreshadowed the Treaty of Verdun (843), which formally divided the Carolingian Empire into three separate kingdoms, shaping the future borders of France, Germany, and Italy.
- They reinforced the role of vernacular languages in governance, leading to an increase in non-Latin texts for political and administrative use.
- They laid the groundwork for national identities based on language, influencing the cultural separation between French and German-speaking regions.
By recognizing that language played a crucial role in political unity, the oaths set a precedent for the growing connection between language and national identity, a concept that would continue to shape European history.
5. A Landmark in the History of European Languages
The Oaths of Strasbourg, sworn on February 14, 842, remain one of the earliest recorded moments of linguistic divergence in Western Europe. More than just a political alliance, these oaths:
Marked the first written emergence of Old French and Old High German, reinforcing the evolution of European languages.
Showcased how language was being used for political legitimacy, proving that rulers needed to address their people in their native tongues.
Foreshadowed the division of Charlemagne’s empire, shaping the territorial, linguistic, and national identities of France and Germany.
Contributed to the decline of Latin as a dominant administrative language, setting the stage for the growth of vernacular literature and national cultures.
Today, the Oaths of Strasbourg stand as a key historical document in the development of both French and German, symbolizing the linguistic and political shifts that defined medieval Europe.
When politics and language collide, history is written—literally!

Originally published on February 14, 2025, on The-English-Nook.com.
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