Maucat, wrong. It is Peking.

If you misspelled Mithridates, he was a king of Greece during the early part of Julius Caesar's military career. If you spelled "Mithridate" correctly, I don't know.

@Vixol, @AE Mithridates was king of Pontos, a kingdom in the middle of Asia Minor, which today is Turkey, in the first century BC.
That was one part of the question, because Mithridate is named after this king (he more or less "invented" it). But it was the easy part, what Mithridate actually is is more tricky
Here are some hints: later it was also called Theriac and was made mainly in Venice. It had over 50 different components and was used, in some form or the other, up into the 19th century.

What was the most interesting thing about King Charles the First?

Considering there are 10 King Charleses I listed on Wikipedia, who I presume all had interesting things about them that are differently interesting to different people, you may want to narrow down your question a bit.

@Argentinean: are you sure about Peking? I know that the Romans traded with the Chinese, but I thought that the name Peking was invented waaaaaay later. Like in renaissance era or even later than that. Anyway, I haven’t got a better idea.

I'm pretty sure it's Peking.

@Argentinean: Peking was called Nanjing ("capital of the south") or Yanjing, with reference to the State of Yan. In 1122 it was occupied by the Nüzhen, who founded the Jin dynasty, they moved there (1153) the imperial residence and called it Zhongdu ("central city").
Half-destroyed by Genghiz khān (1215), it was rebuilt (1264-69) by Qūbīlāy khān, founder of the Yuan dynasty, and took on the name of Dadu ("big city").
From 1417 Peking returned capital, with the name of Beijing («capital of the north») which it still conserves. So it was impossible that the Romans called it Peking, the few sources in latin text named that city as Thinae and the entire China as Seres (greek word for the land of chinese). The word Peking is incompatible with the Latin language. I found this to support my answer: many earlier Greek-Roman authors called THINAE (Θῖναι, or Σῖναι, Ptol. 7.3.6, 8.27.12), or THINA (Θῖνα, Arrian, Per. M. Erythr. p. 36), a capital city of the Sinae.
@Argentinean: I suppose that you're wrong.

@Maucat cool. It's always fun to learn something new.

@ztir, a poison or an medicin or aphrodisiac is my best guess from your hint

@Maucat and @Argentinean: after having googled it seems indeed that Thinae might have been their name for Nanjing (the South capital) whereas Beijing is the north capital (i.e. not the same city). So no Maucat, your answer is incorrect too. My guess is that the romans never stumpled upon Beijing at all, since their relations was with the Sinae people who had their capital in Nanjing at the time. Why would they bother going to Beijing? If they did then probably there isn't any known documentation of what they may have called the city, most likely because it wasn't significant enough.

@Vixol you are right! Mithridates was terribly afraid of being poisoned, which is somewhat understandable as it was presumably him who poisoned his parents so that he himself could ascend to power. So he tried to immunise himself by taking small doses of various poisons mixed together.
Mithridates waged 3 wars against Rome (called the Mithridatic wars). In the beginning he was very successful but was at last defeated by Pompey. Hearing of his army's defeat, Mithridates tried to kill himself by poison, but it failed due to his immunisation! (It didn't matter in the end, he had his bodyguard stab him).
Pompey found the recipe of Mithridates' poison mix and brought it to Rome, where it was translated and called Mithridate. It remained in use as antidote and remedy for all kinds of stuff, and was very popular in the Renaissance. Of course, by then the composition was probably very different from the original.

@Argentinean: Peking is the Wade-Giles romanization of Beijing, you may want to know that translate system's developer, Thomas Wade, was born in 1818, so it's no way that Romans knew it earlier.
@d-ice Also, Sinae (Thinae) may not be Nanjing in Roman Era, since in that era, both Nanjing and Beijing are not very-well developed and were more likely border fortresses against Barbarians, Sinae might be used to refer the (southern) capital of ancient China (Yes, different dynasties had different capitals in China), but I don't think it's Nanjing.
According to Chinese articles I've found, Romans may use Seres to call the region of modern western China and Sinae is more likely the region of modern mid-China, where was most luxurious in Roman Era.

1676 is important i scandinavian history. what took place that year during winter?

The Battle of Lund, part of the Scanian War, was fought on December 4, 1676, in an area north of the city of Lund in Scania in southern Sweden, between the invading Danish army and the army of Charles XI of Sweden.

You are of course correct with your almost encyclopedian like answer (I dare say you copied that from wikipedia...).

Extra points for naming the person who checked the ice of Kävlingeån. Hint, the same who checked the ice on the Belts in 1658.

Good point vixol. A reminder to all that this is based on old school knowledge ie no use of the interwebs to learn the answer.

The General of Forifications of Sweden Erik Dahlberg.

Maucat, it's not fun when you use wikipedia to answer the questions.

China had two major "conquest dynasties". What are their names?

I think you're referring to the Qing and Yuan dynasties.

@vixol, no I have a lot of book of history and I like play boardgame of historical simulations since late 70's. There is an old GMT game about the swedish armies battles of 17th century with these informations inside.

December 18 1941, Alexandria of Egypt: four italian incursors riding their "maiali" sank two british Battleships (Queen Elizabeth and Valiant) Who knows the name of the Regia Marina submarine that led them near the port and their names?

Yeah, hadn't heard the term before, but seems likely to refer to the Yuan (Borjigin, mongolian) and Qing (Aisin Gioro, manchu) dynasties.

@Maucat: I suppose you are referring to "Nothing gained but glory". Is the game any good?

@d-ice: yes

@Maucat - I'd be inclined to believe you hadn't copied it if it wasn't identical word for word, punctuation for punctuation, with the Wikipedia entry for the Battle of Lund... Unfortunately it does spoil the fun of it.

Next answers will be in my mother language so I can write without problems and not using Translators, ok?
None is able to answer to my last question?

Here's a question from a niche interest of mine: during the Ukrainian War of Independence, who "led" the Ukrainian anarcho-communist movement?