In 1855, as preparations were being made for the Universal Exhibition in Paris, Lanesson was selected as one of those to be listed in its wine classification, (reportedly at 4th growth level).

1855年进行列级评选的时候，所有人都在为巴黎世博会做着准备，朗森古堡也入选了葡萄酒的评选名单（据说可以被评为四级酒庄）。

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But it was important to keep the risks associated with moderate sun bed use in perspective, she added, with the IARC classification putting it in the same category as sunlight, red wine and beer.

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The classification came about thanks to Napoleon III, who ordered a group of wine brokers to come up with a list of the best Bordeaux in time for the Paris Exposition, a sort of national trade fair.

WSJ: Getting to the Bottom of Bordeaux Wines | On Wine by Lettie Teague

This was the year the Bordeaux Classification went into effect, creating the five "classes" of chateaux that inform wine pricing and valuation to this day.

WSJ: Getting to the Bottom of Bordeaux Wines | On Wine by Lettie Teague