Those who live in The Hague never stopped using an old-fashioned name that described the place according to its medieval use.

Why do we call it The Hague, rather than just Hague? In 1997, four Roman milestones were discovered at Wateringse Veld. The apostille certificate is often called the Hague Apostille or the Apostille of the Hague due to the name of the treaty that introduced the apostille. The 'The' in The Hague is a translation of the Dutch 'Den' (the Dutch name of the city is Den Haag). The Hague is the direct translation of Den Haag, where “den” is an accusative singular masculine form. Originally Answered: Why is the seat of government in the Netherlands called 'The' Hague instead of just Hague?

We get the official name Den Haag from Des Graven Hage, which means “the counts' hedge” and refers to the fact that Dutch noblemen once used the land for hunting. as well). Under this treaty the member countries agreed to recognise apostilles from the other member countries. The originals are in the "Museon" museum. This emerged from the word Die Haghe (see Paul Sijben's answer to Why do we say "The" Hague instead of Hague? Since the late 19th century, The Hague …

The milestones indicate the distance from the nearest Roman city, Forum Hadriani (modern Voorburg) and can be dated to the reign of the emperors Antoninus Pius (138-161; the column is dated 151), Caracalla (211-217), Gordian III (238-244), and Decius (249-251).

We don't really have cases anymore nowadays, but traces of the old case system can still be found in petrified forms like this one. The Hague is the "International City of Peace and Justice." The Hague began to develop during the 13th century when Count Floris of Holland founded het Binnenhof palace.This gothic complex eventually became the administrative centre of Holland and was converted into the Dutch houses of parliament after the Republic of the Seven United Netherlands was established in 1581.

The area was part of the Roman province of Germania Inferior and was close to the border of the empire, the Upper Germanic-Rhaetian Limes. 'Den' is, I think, the old accusative form of the Dutch article.