М.О. means Милош Обреновић, Prince Miloš Obrenović. The fountain was built in honour of his return to Serbian throne (for the second time) between 1858 and 1860. I think this will help. For more information about him, see page Miloš Obrenović I, Prince of Serbia (talk) Alexzr88 17:25, 13 June 2006 (UTC)
Treaty of Trianon
No harm meant, I just didn't want to find where your edit was changing mine, since I didn't want to implicitly push your edit, and I have no idea how far the HRA got into present-day Slovakia.
About the rivers, I changed the names because their articles are at the Romanian name, but I don't care much which name is used... feel free to change it back to the hu: ones.
And, btw, welcome! :)
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