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We assembled genome-wide data from 271 ancient Iberians, of whom 176 are from the largely unsampled period after 2000 BCE, thereby providing a high-resolution time transect of the Iberian Peninsula. We document high genetic substructure between northwestern and southeastern hunter-gatherers before the spread of farming. We reveal sporadic contacts between Iberia and North Africa by ~2500 BCE and, by ~2000 BCE, the replacement of 40% of Iberia's ancestry and nearly 100% of its Y-chromosomes by people with Steppe ancestry. We show that, in the Iron Age, Steppe ancestry had spread not only into Indo-European-speaking regions but also into non-Indo-European-speaking ones, and we reveal that present-day Basques are best described as a typical Iron Age population without the admixture events that later affected the rest of Iberia. Additionally, we document how, beginning at least in the Roman period, the ancestry of the peninsula was transformed by gene flow from North Africa and the eastern Mediterranean., J.M.F., F.J.L.-C., J.I.M., F.X.O., J.D., and M.S.B. were supported by HAR2017-86509-P, HAR2017-87695-P, and SGR2017-11 from the Generalitat de Catalunya, AGAUR agency. C.L.-F. was supported by Obra Social La Caixa and by FEDER-MINECO (BFU2015- 64699-P). L.B.d.L.E. was supported by REDISCO-HAR2017-88035-P (Plan Nacional I+D+I, MINECO). C.L., P.R., and C.Bl. were supported by MINECO (HAR2016-77600-P). A.Esp., J.V.-V., G.D., and D.C.S.-G. were supported by MINECO (HAR2009-10105 and HAR2013-43851-P). D.J.K. and B.J.C. were supported by NSF BCS-1460367. K.T.L., A.W., and J.M. were supported by NSF BCS-1153568. J.F.-E. and J.A.M.-A. were supported by IT622-13 Gobierno Vasco, Diputación Foral de Álava, and Diputación Foral de Gipuzkoa. We acknowledge support from the Portuguese Foundation for Science and Technology (PTDC/EPH-ARQ/4164/2014) and the FEDER-COMPETE 2020 project 016899. P.S. was supported by the FCT Investigator Program (IF/01641/2013), FCT IP, and ERDF (COMPETE2020 – POCI). M.Si. and K.D. were supported by a Leverhulme Trust Doctoral Scholarship awarded to M.B.R. and M.P. D.R. was supported by an Allen Discovery Center grant from the Paul Allen Foundation, NIH grant GM100233, and the Howard Hughes Medical Institute. V.V.-M. and W.H. were supported by the Max Planck Society.

This paper presents an overview of the current state of research on Roman, Late Antique and medieval agriculture in the Iberian Peninsula through the study of archaeobotanical samples (seeds and fruits) collected on a large number of rural and urban sites spread throughout Iberia's geography. It includes published and unpublished data. The plant taxa of economic interest are grouped into various categories: cereals, cereal chaff, legumes, domesticated fruits, oil/fibre plants, condiments and spices, and wild species. According to the data, naked wheats and hulled barley are the dominant cereal species throughout the Iberian Peninsula. There are, nonetheless, particularities like the prevalence of hulled wheats (mainly emmer and spelt) in the North-west. Cultivated fruits also show a great diversity, and new species such as Morus nigra or Prunus armeniaca appear for the first time in the archaeobotanical record. There are also novelties regarding herbs and spices., The contributions of L. Peña-Chocarro and G. Pérez Jordà are within the framework of the project FRUITFUL: La introducción y el desarrollo de la arboricultura en la Península Ibérica (HAR2015-64953-P) funded by the Spanish Ministerio de Economía y Competitividad and coordinated by L. Peña-Chocarro. G. Pérez Jordà's participation is carried out within the post-doctoral contract IJCI-2015-25082 funded by the Spanish Ministerio de Economía, Industria y Competitividad. Natàlia Alonso's participation is within the framework of projects SGR2014-273 and HAR2016-78277-R: Prácticas agroalimentarias, asentamientos y espacios domésticos. Relaciones y evolución en los llanos sur-pirenáicos (III-I milenios ANE), funded by Ministerio de Economía, Industria y Competitividad (SGR2014-273 and HAR2016-78277-R) and coordinated by N. Alonso. J.P. Tereso was supported by a Post-doc grant (SFRH/BPD/88250/2012) from Fundação para a Ciência e a Tecnologi