2024

• Conference lecture
  Petersen, Leif Inge Ree. (2024) Christian insurgencies in the Eastern Taurus Mountains during the Abbasid revolution. Swedish Institute in Istanbul Research Seminar
• Conference lecture
  Petersen, Leif Inge Ree. (2024) Sasanidenes krigselefanter: Klima, krigføring og kunnskapsoverføring i det senantikke Eurasia. NTNUs Middelalderseminar

2023

• Conference 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. Rom als sakrale Landschaft vom Mittelalter bis zur Neuzeit
• Conference lecture
  Petersen, Leif Inge Ree. (2023) (Managing) Steppe Influences on Byzantine Warfare and Military Organisation, 800-1100. International Medieval Congress, Leeds
• Conference lecture
  Petersen, Leif Inge Ree. (2023) The rhetoric of realism in the siege accounts in the Miracles of St. Demetrios. Realism in Hagiography

2022

• Feature article
  Petersen, Leif Inge Ree. (2022) Slaget på Stiklestad og historikerens håndverk.
• Lecture
  Petersen, Leif Inge Ree. (2022) De norske vikingkongene i Austerveg: Kyiv-riket og østlig innflytelse på Norge, ca. 1000-1050. Olsokdagene på Stiklestad
• Conference 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). 24th International Congress of Byzantine Studies

2020

• Conference lecture
  Petersen, Leif Inge Ree. (2020) Imperial Legitimacy and the Rhetoric of Power in Seventh-Century Hagiography. 4th International Byzantine Seminar Lecture Series: Power and Rhetoric in Byzantium

2019

• Interview
  Milbank, Dana; Petersen, Leif Inge Ree. (2019) Opinion: Trump's wall isn't evil. It's medieval.
• Conference lecture
  Petersen, Leif Inge Ree. (2019) The “fighting champion” Demetrios and 7th-century imperial ideology: the case of the Perboundos affair. Saints at War

2017

• Conference lecture
  Petersen, Leif Inge Ree. (2017) Homer in the North. The Scandinavian Tradition of Homeric Scholarship. Academia Homerica Euroclassica

2016

• Conference 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. Hierarchy and Equality: Representations of Sex/Gender in the Ancient World
• Conference 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. International Congress of Byzantine Studies
• Conference lecture
  Petersen, Leif Inge Ree. (2016) The Imperial Foundations of Frankish and Visigothic Military Organization: Some Methodological Considerations. Military Organisation and Society in the post-Roman World
• Lecture
  Petersen, Leif Inge Ree. (2016) Råflaks eller iskald kalkyle? Den internasjonale konteksten for Olavs seier i slaget ved Nesjar. Olsokdagene: Talerstolen Stiklestad

2015

• Conference 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. From Heraclius to Urban II: Trends and Themes in Medieval Christian Holy War
• Conference lecture
  Petersen, Leif Inge Ree. (2015) Il declino dell'Holy Man e la nascita del santo militare come eroe guerriero nel VII secolo. Incontri di storia e cultura tardoantica e bizantina
• Feature article
  Petersen, Leif Inge Ree. (2015) Romerrikets fall er ikke fasit på dagens flyktningsituasjon.
• Conference lecture
  Petersen, Leif Inge Ree. (2015) Siege Warfare in Late Antique and Early Medieval Italy. Guerres et Richesses: Conflits armes et dynamiques socio-économiques dans l'Italie du haut moyen-age (VIIe-IXe siecle)

2014

• Conference lecture
  Petersen, Leif Inge Ree. (2014) The Fate and Role of Female Captives of War in the Early Caliphate, c. 640-750. Common Men and Women at War, 300-1500 AD
• Conference lecture
  Petersen, Leif Inge Ree. (2014) Byzantium and the Northern Barbarians, 400-800 AD. En Días de Alta Edad Media

2013

• Lecture
  Petersen, Leif Inge Ree. (2013) Den bysantinske majoritetsbefolkningen og de islamske erobrerne i Syria, Palestina og Egypt, 640-720. Fagkveld: "De Fremmede"

2012

• Conference 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. Beyond Borders Seminar on Transnational History
• Interview
  Petersen, Leif Inge Ree. (2012) Historien om en romersk katapult.

2011

• Interview
  Geisnes, Rune; Petersen, Leif Inge Ree. (2011) Antikkens våpen.

2009

• Conference lecture
  Petersen, Leif Inge Ree. (2009) Seventh-Century Siege Warfare and the Diffusion of the Traction Trebuchet. The Age of Justinian and Muhammad
• Conference lecture
  Petersen, Leif Inge Ree. (2009) Siege Warfare in Computer Games: Problems and Possibilities. Greek and Roman Games in the Computer Age

2008

• Conference lecture
  Petersen, Leif Inge Ree. (2008) The social history of the Trebuchet. Privatissimum, o. prof. Dr. Johannes Koder
• Conference lecture
  Petersen, Leif Inge Ree. (2008) Militær organisering på 900-tallet: fra Hordaland til Hindu Kush. Instituttseminar
• Conference lecture
  Petersen, Leif Inge Ree. (2008) Slaget på Stiklestad i lys av samtidens militære teknologi og praksis. Onsdagstreff

2007

• Conference lecture
  Petersen, Leif Inge Ree. (2007) Bysantinsk og vestleg militær organisering, 750-1000. Faglig-pedagogisk dag

2006

• Conference lecture
  Petersen, Leif Inge Ree. (2006) Forsvarsverkene i Konstantinopel. Sommerkurs ved det svenske instituttet i Istanbul

2005

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

2004

• Conference lecture
  Petersen, Leif Inge Ree. (2004) Militær organisering i Noreg: Romerske, frankiske, anglo-saksiske og bysantinske modellar for leidangen. Instituttseminar
• Conference lecture
  Petersen, Leif Inge Ree. (2004) Bysantinsk innflytelse på vestleg militær praksis, ca. 850-1150. Presentasjon av doktorgradsprosjekt. Årsmøte,Norsk komite for bysantinske studier (NKBS)

2003

• Conference lecture
  Petersen, Leif Inge Ree. (2003) Hvor lærte Harald å råde hardt? Harald Hardråde i Bysants. Forskningsdagene