As part of his alliance with France, Philip married Maria of Savoy, daughter of
Amadeus IX of Savoy, and one of the nieces of
Louis XI, King of France, in 1478. which ruled the
margraviate of
Baden on the possibility of an inheritance treaty. Philip continued the negotiations with
Christopher I, Margrave of Baden and on 31 August 1490, they came to an agreement on reciprocal inheritance. The background of this treaty was that Christopher I intended his son and heir
Philip I to marry Joan, the heiress of Hachberg-Sausenberg. This marriage did not materialize, due to political pressure from the French king. His daughter,
Johanna of Hachberg-Sausenberg (born ca. 1485 – died 1543), became Countess of Neuchâtel after her father's death in 1503, while Christopher obtained
Sausenberg, Rötteln,
Badenweiler and
Schopfheim. In 1504, she married
Louis d'Orléans-Longueville who, not yet having inherited his father's dukedom of Longueville, became known,
jure uxoris, as the
Marquis de Rothelin (Rötteln) (after Joan died in 1543, her son François assumed the title of
Marquis de Rothelin, thereby starting the cadet line of Orléans-Rothelin). Joan and the
House of Orléans-Longueville contested the Rötteln treaty and they tried to rally support for their case from the Swiss cantons of
Solothurn,
Lucerne,
Fribourg and
Bern. The dispute was settled in 1581, with the House of Baden paying to the House of Orléans-Longueville, but securing for Christopher's great-grandson
Margrave Georg Friedrich of Baden-Durlach Sausenberg, Rötteln and Badenweiller in 1584. ==Gallery==