who is the monarch that ruled over the french city mentioned here?
Louis VII of France, Philip II of France
Paris
In 1163, during the reign of Louis VII, Maurice de Sully, bishop of Paris, undertook the construction of the Notre Dame Cathedral at its eastern extremity.

After the marshland between the river Seine and its slower 'dead arm' to its north was filled in around the 10th century, Paris' cultural centre began to move to the Right Bank. In 1137, a new city marketplace (today's Les Halles) replaced the two smaller ones on the Île de la Cité and Place de la Grève (Place de l'Hôtel de Ville). The latter location housed the headquarters of Paris' river trade corporation, an organisation that later became, unofficially (although formally in later years), Paris' first municipal government.

In the late 12th century, Philip Augustus extended the Louvre fortress to defend the city against river invasions from the west, gave the city its first walls between 1190 and 1215, rebuilt its bridges to either side of its central island, and paved its main thoroughfares. In 1190, he transformed Paris' forme
having all units in atomic standards is more useful. explain UNANSWERABLE is there a body or organization that controls it? Yes - General Conference on Weights and Measures (CGPM) when was this established? 20 May 1875 which are the states that are members of this conference? Argentina,  Australia, Austria to name a few.. who hosts or conducts this conference? General Conference on Weights and Measures (CGPM), CGPM meetings are chaired by the Président de l'Académie des Sciences de Paris. what is the objective of this academy mentioned here? To encourage and protect the spirit of French scientific research. where is this academy located? Institut de France, Paris, France
wiki:25616125
Paris [SEP] Middle Ages to Louis XIV
By the end of the 12th century, Paris had become the political, economic, religious, and cultural capital of France. The Palais de la Cité, the royal residence, was located at the western end of the Île de la Cité. In 1163, during the reign of Louis VII, Maurice de Sully, bishop of Paris, undertook the construction of the Notre Dame Cathedral at its eastern extremity. After the marshland between the river Seine and its slower 'dead arm' to its north was filled in around the 10th century, Paris' cultural centre began to move to the Right Bank. In 1137, a new city marketplace (today's Les Halles) replaced the two smaller ones on the Île de la Cité and Place de la Grève (Place de l'Hôtel de Ville).