Queen Victoria was the last British monarch of the House of Hanover. Her reign lasted an astounding 63 years and 7 months, from 1837 until her death in 1901, the longest of any British monarch. It is during her reign that the British Empire reached its zenith, spanning the globe and giving us the expression "the sun never sets on the British Empire". To this day, she is the most commemorated monarch in British history. In Canada, we commemorate her by drinking excessively on the third Monday of every May. As far as I know, Victoria day is a holiday unique to Canada, thankfully she wasn't born in he middle of winter, we wouldn't celebrate it in the same way.
All of the official documents prepared on the first day of her reign described her as Queen Alexandrina Victoria (her real name), however, at her own wish it was ammended to Victoria, which I think sounds more regal. Queen Alex probably wouldn't have had the same impact. As well as being the Queen of a whole bunch of nations, in 1876 she became the first Empress of India of the British Raj.
There isn't a Royal family in Europe today that isn't somehow related to one of Victoria's nine children. The German Emperor Wilhelm II was her eldest grandchild. Through marriage her children and grandchildren united many of the royal houses of Europe, making for some very strange alliances. Her son Edward VII was the first British monarch belonging to the House of Saxe-Coburg and Gotha (the name was changed to Windsor in 1917 for pretty obvious reasons).
Now for your Victoria Day treat, may I present the inimitable Ray Davies and the Kinks