Raoul Wallenberg was a Swedish diplomat who rescued thousands of Hungarian Jews from deportation during the Second World War. He arrived to Budapest in 1944 as a secretary of the Swedish embassy and began issuing protective passes (printed in yellow and blue with the coat of arms of Sweden), to reach his goal of rescuing as many Hungarian Jewish people as possible from deportation. Also, he set up approximately 30 so-called Swedish houses, a series of shelters where the Jews could seek refuge. It was possible thanks to the fact that Sweden was a neutral country. Unfortunately, when the Russian troops entered Budapest in January 1945, Wallenberg was arrested - his fate remains unknown up until now.