Former countries similar to or like Ottoman Empire

Federal socialist state in Northern Eurasia that existed from 1922 to 1991. One-party state prior to 1990 governed by the Communist Party, with Moscow as its capital in its largest republic, the Russian SFSR. Wikipedia

Early modern empire in South Asia. For some two centuries, the empire stretched from the outer fringes of the Indus basin in the west, northern Afghanistan in the northwest, and Kashmir in the north, to the highlands of present-day Assam and Bangladesh in the east, and the uplands of the Deccan plateau in south India. Wikipedia

State which existed from 1861—when King Victor Emmanuel II of Sardinia was proclaimed King of Italy—until 1946, when civil discontent led an institutional referendum to abandon the monarchy and form the modern Italian Republic. Founded as a result of the unification of Italy under the influence of the Savoy-led Kingdom of Sardinia, which can be considered its legal predecessor state. Wikipedia

One of the greatest Iranian empires after the 7th-century Muslim conquest of Persia, ruled from 1501 to 1736 by the Safavid dynasty. Often considered the beginning of modern Iranian history, as well as one of the gunpowder empires. Wikipedia

Roman civilization from the founding of the Italian city of Rome in the 8th century BC to the collapse of the Western Roman Empire in the 5th century AD, encompassing the Roman Kingdom , Roman Republic (509 BC–27 BC) and Roman Empire (27 BC–476 AD) until the fall of the western empire. Italic settlement in the Italian Peninsula, traditionally dated to 753 BC, that grew into the city of Rome and which subsequently gave its name to the empire over which it ruled and to the widespread civilisation the empire developed. Wikipedia

The last Persian imperial dynasty before the Muslim conquest in the mid seventh century AD. Named after the House of Sasan, it endured for over four centuries, from 224 to 651 AD, making it the longest-lived Persian dynasty. The Sasanian Empire succeeded the Parthian Empire, and reestablished the Iranians as a superpower in late antiquity, alongside its neighbouring arch-rival, the Roman-Byzantine Empire. Wikipedia