The Ironclad Board was an advisory board established by the Union in 1861 in response to the construction of the "CSS Virginia" by the Confederacy during the US Civil War.
 The primary goal of the Ironclad Board was to develop more battle-worthy ("ironclad") ships, leading to the construction a number of innovative designs, including the USS Monitor.
 The Board consisted of senior naval officers Commodore Hiram Paulding, Commodore Joseph Smith, Commander Charles Henry Davis and assistant Secretary of the Navy Gustavus Vasa Fox.
Roma was an ironclad warship built for the Italian "Regia Marina" in the 1860s; she was the lead ship of the "Roma"-class ironclad s. Armed with a main battery of five 10 in and twelve 8 in guns in a broadside arrangement, "Roma" was obsolescent by the time she entered service.
 As a result, her career was limited.
 In 1880, she took part in an international naval demonstration off Ragusa to enforce the Treaty of Berlin.
 In November 1881, she collided with the ironclad "Principe Amedeo" in a storm in Naples, but she was not damaged.
 "Roma" was reduced to a guard ship in 1890 and then to a depot ship in 1895.
 In July 1896, she was scuttled to save the ship from a fire caused by a lightning strike.
 She was thereafter raised and broken up for scrap.
Admiral Sir William Fanshawe Martin, 4th Baronet, {'1': ", '2': ", '3': ", '4': "} (5 December 1801 – 24 March 1895), was a Royal Navy officer.
 As a commander, he provided valuable support to British merchants at Callao in Peru in the early 1820s during the Peruvian War of Independence.
 He became First Naval Lord in the third Derby ministry in March 1858 and in that capacity acted as a strong advocate for the procurement of Britain's first ironclad warship.
 He went on to be Commander-in-Chief, Mediterranean Fleet and in that role provided important assistance during the Italian disturbances in 1860 and 1861, reformed the system of discipline in his fleet and developed a comprehensive system of manoeuvres for steam ships.
USS "Monitor" (LSV-5/AN-1/AP-160/MCS-5) was an "Osage"-class vehicle landing ship built for the United States Navy during World War II.
 She was named after the original  (the first ironclad warship commissioned by the Navy), and was the second U.S. Naval vessel to bear the name.
Terribile was the first ironclad warship to be built for the Italian "Regia Marina" (Royal Navy), and the second member of the "Formidabile" class .
 "Terribile" and her sister, "Formidabile" , were both built in France.
 A broadside ironclad, she was laid down in June 1860, launched in February 1861, and was completed in September that year.
 She was the first Italian ironclad to enter service and was equipped with four 203 mm and sixteen 164 mm guns.
USS "Monitor" was an iron-hulled steamship.
 Built during the American Civil War, she was the first ironclad warship commissioned by the Union Navy.
 "Monitor" is most famous for her central role in the Battle of Hampton Roads on 9 March 1862, where, under the command of Lieutenant John Worden, she fought the casemate ironclad  (built on the hull of the former steam frigate USS "Merrimack" ) to a standstill.
 The unique design of the ship, distinguished by its revolving turret which was designed by American inventor Theodore Timby, was quickly duplicated and established the monitor type of warship.
Kōtetsu (甲鉄 , literally "Ironclad") , later renamed "Azuma" (東 , "East") , was the first ironclad warship of the Imperial Japanese Navy.
 Built in Bordeaux, France in 1864 for the Confederate States Navy as CSS "Stonewall", and acquired from the United States in February 1869, she was an ironclad ram warship.
 She had a decisive role in the Naval Battle of Hakodate Bay in May 1869, which marked the end of the Boshin War, and the complete establishment of the Meiji Restoration.
SMS "Hansa"  was a German ironclad warship built in 1868–1875.
 She was the first ironclad built in Germany; all previous German ironclads had been built in foreign shipyards.
 She was named after the Hanseatic League, known in Germany simply as "Hanse", Latinized "Hansa".
 The ship was launched in October 1872 and commissioned into the German Imperial Navy ("Kaiserliche Marine") in May 1875.
 Designed for overseas service, "Hansa" was classed as an armored corvette and armed with eight 21 cm guns in a central battery.
The gunboat Opyt (Russian: Опыт : experience) was the first ironclad warship commissioned by the Imperial Russian Navy.
 It was built by Carr and MacPherson at the Baltic shipyard in Saint Petersburg.
 English and Russian wrought iron plates 1200 x 1000 mm in size protected the front part of the gunboat.
An ironclad is a steam-propelled warship protected by iron or steel armor plates used in the early part of the second half of the 19th century.
 The ironclad was developed as a result of the vulnerability of wooden warships to explosive or incendiary shells.
 The first ironclad battleship, "Gloire" , was launched by the French Navy in November 1859.
 The British Admiralty had been considering armored warships since 1856 and prepared a draft design for an armored corvette in 1857; in early 1859 the Royal Navy started building two iron-hulled armored frigates, and by 1861 had made the decision to move to an all-armored battle fleet.
 After the first clashes of ironclads (both with wooden ships and with one another) took place in 1862 during the American Civil War, it became clear that the ironclad had replaced the unarmored ship of the line as the most powerful warship afloat.
 This type of ship would come to be very successful in the American Civil War.

Question: Who established the advisory board that developed the first ironclad warship? 
Answer: the Union