Title: List of volcanic eruptions in Iceland
Content:  This is an incomplete list of volcanic eruptions in Iceland. 
Title: Volcanism of Iceland
Content: The volcano system in Iceland that started activity on August 17, 2014, and ended on February 27, 2015, is Bárðarbunga. ; The volcano in Iceland that erupted in May 2011 is Grímsvötn. Iceland experiences frequent volcanic activity, due to its location both on the Mid-Atlantic Ridge, a divergent tectonic plate boundary, and over a hot spot. Nearly thirty volcanoes are known to have erupted in the Holocene epoch; these include Eldgjá, source of the largest lava eruption in human history.
Title: List of volcanic eruptions in Iceland
Content:  Grímsvötn, including the Skaftá eruption of 1783, is probably the most eruptive volcano system. The Lakagígar lava field alone is estimated to have produced about 15 km3 of lava. Grímsvötn has probably had more than 30 eruptions in the last 400 years, and produced around 55 km3 over the last 10,000 years. (Part of the East volcanic zone (EVZ)) Katla has erupted 17 times in historical times, and Eldgjá seems to be part of the same system. The total volume of volcanic eruptions from Katla over the last 10,000 years is very similar to Grímsvötn. (Part of the East volcanic zone (EVZ)) Hekla has erupted at least 17 times in historical times, with total volume about 7 km3, but around 42 km3 since the last ice age. (Part of the East volcanic zone (EVZ))
Title: Iceland
Content:  glacier, Vatnajökull. Grímsvötn is one of Iceland's most active volcanoes, and this eruption was much more powerful than the 2010 Eyjafjallajökull activity, with ash and lava hurled 20 km into the atmosphere, creating a large cloud. A great deal of volcanic activity was occurring in the Reykjanes Peninsula in 2020 and into 2021, after nearly 800 years of inactivity. After the eruption of the Fagradalsfjall volcano on 19 March 2021, National Geographic's experts predicted that this "may mark the start of decades of volcanic activity." The eruption was small, leading to a prediction that this volcano was unlikely to threaten "any population centers". The highest elevation for Iceland is listed as 2,110 m (6,923 ft) at Hvannadalshnúkur (64°00′N 16°39′W).
Title: Iceland hotspot
Content:  The Iceland hotspot is a hotspot which is partly responsible for the high volcanic activity which has formed the Iceland Plateau and the island of Iceland. Iceland is one of the most active volcanic regions in the world, with eruptions occurring on average roughly every three years (in the 20th century there were 39 volcanic eruptions on and around Iceland). About a third of the basaltic lavas erupted in recorded history have been produced by Icelandic eruptions. Notable eruptions have included that of Eldgjá, a fissure of Katla, in 934 (the world's largest basaltic eruption ever witnessed), Laki in 1783 (the world's second largest), and several eruptions beneath ice caps, 
Title: Torfajökull
Content:  Torfajökull (Icelandic for "Torfi's glacier"; ) is a rhyolitic stratovolcano, caldera (central volcano) and complex of subglacial volcanoes, located north of Mýrdalsjökull and south of Þórisvatn Lake, Iceland. Torfajökull last erupted in 1477 and consists of the largest area of silicic extrusive rocks in Iceland. The volcano's eruption around 870, a combined bimodal eruption (rhyolite-basalt) with additional engagement of the Bárðarbunga-Veiðivötn volcanic system, has left a thin layer of easily recognized mixed tephra all over Iceland (Landnámslag). This layer makes it possible to determine the exact dates of many archeological finds by so called tephrochronology, like in the Reykjavík 871±2 museum.
Title: Fagradalsfjall
Content:  valley again on 21 August. The eruption by now had become the second longest in Iceland of the 21st century. The volcano stopped erupting on 2 September, but lava flow resumed on 11 September, with the magma breaking through the lava field surface in several places. However, the main crater channel appeared to have been blocked, and the crater was filled with lava from a source underneath the northwestern wall through a crack on the wall, and lava also flowed outside the volcano through the wall. The average lava flow over the past 32 days had returned to 8.5 m3/s, and the lava field of 
Title: Ice cauldron
Content:  Famous examples from Iceland are the ice cauldrons within the Katla caldera. Katla is an important caldera and central volcano situated under the Mýrdalsjökull glacier cap in the southern part of Iceland's East Volcanic Zone. 150–200 eruptions during Holocene have been attributed to her, and 17 of these happened since Settlement of Iceland in the 8th century. Most of the eruptions had their origin in the ice covered caldera. The last contested big eruption took place in 1918 and initiated a jökulhlaup with an estimated peak discharge of 300,000 m3/sec. Within the caldera 12–17 ice cauldrons are supra- and inglacial 
Title: Volcanism of Iceland
Content:  The most deadly volcanic eruption of Iceland's history was the so-called Skaftáreldar (fires of Skaftá) in 1783. The eruption was in the crater row Lakagígar (craters of Laki) southwest of Vatnajökull glacier. The craters are a part of a larger volcanic system with the subglacial Grímsvötn as a central volcano. Roughly a quarter of the Icelandic population died because of the eruption. Most died not because of the lava flow or other direct effects of the eruption but from indirect effects, including changes in climate and illnesses in livestock in the following years caused by the ash and poisonous gases from the eruption. The eruption is thought to have erupted the largest quantity of lava from a single eruption in historic times.
Title: 2011 eruption of Grímsvötn
Content:   The 2011 eruption of Grímsvötn was a Plinian eruption of Grímsvötn, Iceland's most active volcano, which caused disruption to air travel in Northwestern Europe from 22–25 May 2011. The last eruption of Grímsvötn was in 2004, with the previous most powerful eruptions in 1783, 1873 and 1902. The Grímsvötn eruption was the largest eruption in Iceland for 50 years.

Question: when did the last volcano erupt in iceland?
Answer: 2010.