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Summary Geoffrey de Montbray was one of the most important men in Normandy and England during the second half of the eleventh century. As bishop of Coutances, Geoffrey made a significant contribution to the restoration of ecclesiastical life in western Normandy. In post-Conquest England, where Geoffrey became a great landholder, he played a pivotal role in the consolidation of the Conqueror’s victory. Geoffrey’s role in the conquest and settlement of England, and in particular his association with warfare, has overshadowed his achievements as a diocesan bishop. In modern historiography he has been presented as an example of an old-fashioned type of bishop that was gradually being superseded in Normandy by more reform-minded prelates. This thesis will assess the validity of this interpretation by providing a detailed examination of his career. But it will also consider his activities as a diocesan bishop and his participation in the settlement of England in the context of the development of his personal relationship with the Conqueror. In particular, it will examine the significance of charismatic elements of lordship and the importance of acquiring ‘closeness’ to a ruler as a means of self-advancement. By approaching Geoffrey’s career from his perspective, the intention of this thesis is to gain a better understanding of the mindset of an eleventh-century Norman bishop. This thesis uses a range of sources that includes charters and narrative sources, architectural evidence, the evidence of Domesday Book, and manuscript sources.

The microwave spectrum of the open-shell van der Waals complex NO-HF has been recorded in the region 6-20GHz using a pulsed nozzle Fourier transform microwave spectrometer. This is the first observation of the microwave spectrum of a open-shell van der Waals complex between two molecules. The spectrum exhibits a rich hyperfine structure with the observation of intermolecular hyperfine interactions in an isolated system providing a sensitive probe of electron transfer in the complex. The spectrum consists of four fine structure transitions 5/2(e)-3/2(e), 3/2(e)-1/2(e), 5/2(f)-3/2(f), 3/2(f)-1/2(f) which have been fitted to a semi-rigid Hamiltonian developed to include the effects of the orbital and spin angular momenta of the unpaired electron on NO. A new treatment to account for the intermolecular hyperfine interaction was developed. The structure of the complex has been determined and is significantly bent with an angle of between 37 degrees and 49 degrees between the NO internuclear axis and the a-axis of the complex. The Renner-Teller parameter, epsilon 2, is very large and negative having the value of -10 449.32(4)GHz indicating that configuration with the unpaired electron in the plane of the complex is more stable. The analysis of the hyperfine interactions of the hydrogen and fluorine nuclei uses two constants for each nucleus, one for the spatial relationship between the magnetic moments of the unpaired electron and the nuclear magnetic moment and a Fermi-contact term. The Fermi-contact term for hydrogen is the first strong evidence of intermolecular charge transfer in an isolated van der Waals molecule.