Question: What state existed from 1861, when King Victor Emmanuel II of Sardinia was proclaimed King of Italy, was the subject to the plotting of  an insurrection in Italian Eritrea by the government of Ethiopia?

Context paragraphs:
Battle of Halai: The Battle of Halai, or the Battle of Halay, which took place in December 1894, was one of the opening battles of the First Italo-Ethiopian War.  In the 1890s, the government of Ethiopia began plotting an insurrection in Italian Eritrea to push back against Italian encroachment on their country.  On December 15, 1894, Bahta Hagos, the "chief of Okule-Kasai province in northern Tigré," launched a rebellion against the Italian authorities.  On December 18, a force of Italian troops, led by Major Pietro Toselli discovered that a small Italian fort at Halai (garrisoned by 220 men) was being besieged by 1,600 of Bahta's rebels.  Toselli attacked with 1,500 men, hitting his enemy (who "had almost taken the fort") in the rear.  Bahta was killed in the ensuing battle and his army fell apart.  In total, eleven Italians were killed and twenty-two wounded in the action.

House of Savoy: The House of Savoy (Italian: "Casa Savoia" ), is a royal family that was established in 1003 in the historical Savoy region.  Through gradual expansion, the family grew in power from ruling a small county in the Alps of northern Italy to absolute rule of the kingdom of Sicily in 1713.  Through its junior branch, the House of Savoy-Carignano, it led the unification of Italy in 1861 and ruled the Kingdom of Italy from 1861 until 1946 and, briefly, the Kingdom of Spain in the 19th century.  The Savoyard kings of Italy were Victor Emmanuel II, Umberto I, Victor Emmanuel III, and Umberto II.  The last monarch ruled for a few weeks before being deposed following the Constitutional Referendum of 1946, after which the Italian Republic was proclaimed.

Francis II of the Two Sicilies: Francis II (Italian: "Francesco II" , christened "Francesco d'Assisi Maria Leopoldo", 16 January 1836 – 27 December 1894) was King of the Two Sicilies from 1859 to 1861.  He was the last King of the Two Sicilies, as successive invasions by Giuseppe Garibaldi and Victor Emmanuel II of Sardinia ultimately brought an end to his rule, as part of Italian unification.  After he was deposed, the Kingdom of the Two Sicilies and the Kingdom of Sardinia were merged into the newly formed Kingdom of Italy.

Victor Emmanuel II of Italy: Victor Emmanuel II (Vittorio Emanuele Maria Alberto Eugenio Ferdinando Tommaso; 14 March 1820 – 9 January 1878) was King of Sardinia from 1849 until 17 March 1861.  At that point, he assumed the title of King of Italy and became the first king of a united Italy since the 6th century, a title he held until his death in 1878.  The Italians gave him the epithet of "Father of the Fatherland" (Italian: "Padre della Patria" ).

Prince Hermann Friedrich of Leiningen: Prince Hermann Friedrich of Leiningen (born 16 April 1963) is the younger son of Prince Karl of Leiningen and his wife Princess Marie Louise of Bulgaria.  Hermann was born in Toronto, Ontario, as Hermann Friedrich Fernando Roland.  Through his mother, Hermann is a grandson of King Boris III of Bulgaria, a great-grandson of King Victor Emmanuel III of Italy and -great-great-grandson of King Nicholas of Montenegro.  Through his father, he is a great-great-great grandson of Queen Victoria (thus in the line of succession to the British throne), as well as Tsar Alexander II of Russia.  According to Marlene Eilers, Hermann of Leiningen belongs to the Eastern Orthodox Church.  His paternal grandmother was Grand Duchess Maria Kirillovna Romanova of Russia and his maternal grandmother was Princess Giovanna of Savoia, daughter of King Victor Emmanuel III of Italy.

List of consorts of the Savoyard monarchs: Between 1859 and 1861 the Kingdom of Sardinia incorporated the majority of Italian states.  On 17 March 1861 King Victor Emmanuel II was proclaimed King of Italy by the Parliament in Turin.

Prince Vittorio Emanuele, Count of Turin: Prince Vittorio Emanuele of Savoy-Aosta, Infante of Spain, Count of Turin (24 November 1870 – 10 October 1946) was a grandchild of King Victor Emmanuel II and a member of the House of Savoy.  He was a cousin of Victor Emmanuel III.

First Italo-Ethiopian War: The First Italo-Ethiopian War was fought between Italy and Ethiopia from 1895 to 1896.  It originated from a disputed treaty which, the Italians claimed, turned the country into an Italian protectorate.  Italy was supported by the two other triple alliance members Germany and Austria.  Much to their surprise, they found that Ethiopian ruler Menelik II, rather than being opposed by some of his traditional enemies, was supported by them, so the Italian army, invading Ethiopia from Italian Eritrea in 1893, faced a more united front than they expected.  In addition, Ethiopia was supported by Russia, an Orthodox Christian nation like Ethiopia with military advisers, army training, and the sale of weapons for Ethiopian forces during the war.  Ethiopia was also supported diplomatically by the United Kingdom and France in order to prevent Italy from becoming a colonial competitor.  Full-scale war broke out in 1895, with Italian troops having initial success until Ethiopian troops counterattacked Italian positions and besieged the Italian fort of Meqele, forcing its surrender.  Italian defeat came about after the Battle of Adwa, where the Ethiopian army dealt the heavily outnumbered Italians a decisive blow and forced their retreat back into Eritrea.

Louis Victor, Prince of Carignano: Louis Victor of Savoy (25 September 1721 – 16 December 1778) headed a French cadet branch of the Italian dynasty which reigned over the Kingdom of Sardinia, being known as the Prince of Carignano from 1741 till his death.  Upon extinction of the senior line of the family, his great-grandson succeeded to the royal throne as King Charles Albert of Sardinia, while his great-great-grandson, Victor Emmanuel II, became King of Italy.

Kingdom of Italy: The Kingdom of Italy (Italian: "Regno d'Italia" ) was a state which existed from 1861, when King Victor Emmanuel II of Sardinia was proclaimed King of Italy, until 1946, when a constitutional referendum led civil discontent to abandon the monarchy and form the Italian Republic.  The state was founded as a result of the unification of Italy under the influence of the Kingdom of Sardinia, which can be considered its legal predecessor state.

Supporting paragraphs: Battle of Halai Kingdom of Italy
Answer: Kingdom of Italy