Swansong of the diphthong : Runic inscription orthography in 11th century Östergötland

Abstract: The orthography of Östergötland’s 11th century runic inscriptions varies widely, in part due to the lack of spelling norms at the time. This thesis seeks to identify other causes for the observed variation, based on the frequency and distribution of aspects of inscription orthography. The Old Norse words ræisa and stæin in the phrase “raised the stone” were analyzed based on the main vowel and its status as a monograph or digraph. The presence or absence of þ in inflected ræisa was also included as an indicator of age. All runic inscriptions in Östergötland with definite key word orthography were included, 169 in total. The analysis reveals that most inscriptions are clustered in three regions, each with a dominant vowel. By region, these are ei (west), i (central) and ai (east), with vowel consistency between ræisa and stæin the norm. The consonant þ in inflected ræisa is most common in the west and east. The vowel orthography together with the distribution of þ implies a relative chronology for Östergötland’s runic inscriptions, where the ongoing monophthongization is reflected in digraphs and monographs. The detailed orthography distribution of these variables shows that the main clusters align with the known 11th century quarries at Borghamn (west) and Vreta (central). Stoneworking at a shared site resulted in a transfer of knowledge, including runestone design and orthography which became a local norm as it spread. The lack of a unifying quarry in eastern Östergötland resulted in a more diverse local orthography, and possibly hampered the building of the first stone churches during the early 12th century.