2023

• Academic lecture
  Petersen, Leif Inge Ree. (2023) The rhetoric of realism in the siege accounts in the Miracles of St. Demetrios. Claudia Sode & Douglas Whalin Realism in Hagiography , Universität Köln 2023-01-12 - 2023-01-13
• Academic lecture
  Petersen, Leif Inge Ree. (2023) The sacral landscape of Rome in the 7th century: from global to local history in a late antique society . Römisches Institut des Görres-Gesellschaft Rom als sakrale Landschaft vom Mittelalter bis zur Neuzeit , Römisches Institut der Görres-Gesellschaft, Vatikanet 2023-03-23 - 2023-03-25
• Academic lecture
  Petersen, Leif Inge Ree. (2023) (Managing) Steppe Influences on Byzantine Warfare and Military Organisation, 800-1100. Institute for Medieval Studies, Leeds International Medieval Congress, Leeds , University of Leeds 2023-07-03 - 2023-07-06

2022

• Popular scientific lecture
  Petersen, Leif Inge Ree. (2022) De norske vikingkongene i Austerveg: Kyiv-riket og østlig innflytelse på Norge, ca. 1000-1050. Stiklestad Nasjonale Kultursenter Olsokdagene på Stiklestad , Stiklestad 2022-07-27 -
• Academic lecture
  Petersen, Leif Inge Ree. (2022) From Political and Religious Dissent to Treason and Collaboration: Byzantine-Arab Warfare in the Age of Constans and Mu'awiya (640s-660s). Association Internationale des Études Byzantins 24th International Congress of Byzantine Studies , Venezia og Padova 2022-08-22 - 2022-08-27

2020

• Academic lecture
  Petersen, Leif Inge Ree. (2020) Imperial Legitimacy and the Rhetoric of Power in Seventh-Century Hagiography. Institute for the History of Ancient Civilizations (IHAC) 4th International Byzantine Seminar Lecture Series: Power and Rhetoric in Byzantium , Northeast Normal University, Changchun 2020-11-03 - 2020-11-03

2019

• Academic lecture
  Petersen, Leif Inge Ree. (2019) The “fighting champion” Demetrios and 7th-century imperial ideology: the case of the Perboundos affair. Leif Inge Ree Petersen, IHS, NTNU Saints at War , Trondheim 2019-02-23 - 2019-02-24
• Interview
  Milbank, Dana; Petersen, Leif Inge Ree. (2019) Opinion: Trump's wall isn't evil. It's medieval. Washington Post Washington Post [Newspaper] 2019-01-09

2017

• Academic lecture
  Petersen, Leif Inge Ree. (2017) Homer in the North. The Scandinavian Tradition of Homeric Scholarship. Euroclassica / Academia Homerica Chios Academia Homerica Euroclassica , Chios 2017-07-15 - 2017-07-23

2016

• Academic lecture
  Petersen, Leif Inge Ree. (2016) A Reassessment of Byzantine and Arab Operations 634-37 AD Based on a Multispectral Reading of BL Syriac MS Add 14461, A Fragment on the Arab Conquest. Serbian Academy of Sciences and Arts International Congress of Byzantine Studies , University of Belgrade 2016-08-22 - 2016-08-27
• Academic lecture
  Petersen, Leif Inge Ree. (2016) The Fate and Role of Captive Women and Concubines in Late Antiquity: Three Representations from the Late Roman Empire. UiO Center for Gender Research; Norwegian Institute at Athen Hierarchy and Equality: Representations of Sex/Gender in the Ancient World , Athens 2016-09-11 - 2016-09-13
• Popular scientific lecture
  Petersen, Leif Inge Ree. (2016) Råflaks eller iskald kalkyle? Den internasjonale konteksten for Olavs seier i slaget ved Nesjar. Stiklestad nasjonale kultursenter Olsokdagene: Talerstolen Stiklestad , Stiklestad 2016-07-30 -
• Academic lecture
  Petersen, Leif Inge Ree. (2016) The Imperial Foundations of Frankish and Visigothic Military Organization: Some Methodological Considerations. Laury Sarti Military Organisation and Society in the post-Roman World , Freie Universität Berlin Friedrich-Meinecke-Institut 2016-08-15 - 2016-08-16

2015

• Academic lecture
  Petersen, Leif Inge Ree. (2015) Siege Warfare in Late Antique and Early Medieval Italy. École Française de Rome Guerres et Richesses: Conflits armes et dynamiques socio-économiques dans l'Italie du haut moyen-age (VIIe-IXe siecle) , Roma 2015-12-15 - 2015-12-16
• Academic lecture
  Petersen, Leif Inge Ree. (2015) Il declino dell'Holy Man e la nascita del santo militare come eroe guerriero nel VII secolo. Sez. Filologia greca e latina, Dip. Scienze dell'Antichità Incontri di storia e cultura tardoantica e bizantina , Università La Sapienza, Roma 2015-05-05 - 2015-05-05
• Academic lecture
  Petersen, Leif Inge Ree. (2015) The Fall of the Holy Man and Rise of the Military Saint as Champion of War in the 7th Century. Cambridge University From Heraclius to Urban II: Trends and Themes in Medieval Christian Holy War , Trinity College, Cambridge 2015-05-01 - 2015-05-01

2014

• Academic lecture
  Petersen, Leif Inge Ree. (2014) The Fate and Role of Female Captives of War in the Early Caliphate, c. 640-750. Institutt for Historiske Studier ved Leif Inge Ree Petersen Common Men and Women at War, 300-1500 AD , NTNU Dragvoll 2014-06-02 - 2014-06-04
• Academic lecture
  Petersen, Leif Inge Ree. (2014) Byzantium and the Northern Barbarians, 400-800 AD. Universidad de Extremadura, ved prof. Manuel Rojas Gabriel En Días de Alta Edad Media , Universidad de Extremadura, Cáceres 2014-04-08 - 2014-04-09

2013

• Lecture
  Petersen, Leif Inge Ree. (2013) Den bysantinske majoritetsbefolkningen og de islamske erobrerne i Syria, Palestina og Egypt, 640-720. Fagutvalget for historiske studier Fagkveld: "De Fremmede" , Olavs Pub og Spiseri, Trondheim 2013-10-15 - 2013-10-15

2012

• Academic lecture
  Petersen, Leif Inge Ree. (2012) 'An alliance with Hell'? Christian client rulers of the Umayyad dynasty from the Caucasus to Provence, 640-750 AD. Swedish Research Institute in Istanbul and IHS, NTNU Beyond Borders Seminar on Transnational History , Istanbul 2012-10-25 - 2012-10-26
• Interview
  Petersen, Leif Inge Ree. (2012) Historien om en romersk katapult. Morgenbladet Morgenbladet [Newspaper] 2012-02-10

2011

• Interview
  Geisnes, Rune; Petersen, Leif Inge Ree. (2011) Antikkens våpen. Høgskoleavisa Høgskoleavisa [Newspaper] 2011-10-06

2009

• Academic lecture
  Petersen, Leif Inge Ree. (2009) Siege Warfare in Computer Games: Problems and Possibilities. Institutt for historie og klassiske fag/HF-fakultetet, NTNU Greek and Roman Games in the Computer Age , Trondheim 2009-02-21 - 2009-02-22
• Academic lecture
  Petersen, Leif Inge Ree. (2009) Seventh-Century Siege Warfare and the Diffusion of the Traction Trebuchet. Dr. Peter Sarris, Trinity College, University of Cambridge The Age of Justinian and Muhammad , Cambridge 2009-03-09 -

2008

• Academic lecture
  Petersen, Leif Inge Ree. (2008) Slaget på Stiklestad i lys av samtidens militære teknologi og praksis. Stiklestad nasjonale kultursenter Onsdagstreff , Stiklestad 2008-11-05 -
• Academic lecture
  Petersen, Leif Inge Ree. (2008) Militær organisering på 900-tallet: fra Hordaland til Hindu Kush. Institutt for historie og klassiske fag, NTNU Instituttseminar , Trondheim 2008-03-05 -
• Academic lecture
  Petersen, Leif Inge Ree. (2008) The social history of the Trebuchet. Institut für Byzantinistik und Neogräzistik Privatissimum, o. prof. Dr. Johannes Koder , Wien 2008-10-27 -

2007

• Academic lecture
  Petersen, Leif Inge Ree. (2007) Bysantinsk og vestleg militær organisering, 750-1000. NTNU Faglig-pedagogisk dag , Trondheim 2007-11-30 -

2006

• Academic lecture
  Petersen, Leif Inge Ree. (2006) Forsvarsverkene i Konstantinopel. Det svenske instituttet i Istanbul Sommerkurs ved det svenske instituttet i Istanbul , Istanbul 2006-06-22 -

2005

• Academic lecture
  Petersen, Leif Inge Ree. (2005) Etniske grupper i den bysantiske hæren, ca. 500 - 1200 e.Kr. NTNU Faglig-pedagogisk dag, NTNU , Dragvoll 2005-11-25 - 2005-11-25

2004

• Academic lecture
  Petersen, Leif Inge Ree. (2004) Militær organisering i Noreg: Romerske, frankiske, anglo-saksiske og bysantinske modellar for leidangen. Institutt for historie og klassiske fag, NTNU Instituttseminar , Trondheim 2004-12-04 -
• Academic lecture
  Petersen, Leif Inge Ree. (2004) Bysantinsk innflytelse på vestleg militær praksis, ca. 850-1150. Presentasjon av doktorgradsprosjekt. (NKBS) Årsmøte,Norsk komite for bysantinske studier (NKBS) , Universitetet i Bergen 2004-11-27 -

2003

• Academic lecture
  Petersen, Leif Inge Ree. (2003) Hvor lærte Harald å råde hardt? Harald Hardråde i Bysants. NTNU Forskningsdagene , Trondheim 2003-09-24 -