Briffa gives a Northern Hemisphere proxy chart back to 1400 in letter to Nature on the influence of volcanic eruptions [Vol393, 4 JUNE 1998 on page 451]
Influence of volcanic eruptions on Northern Hemisphere summer temperature over the past 600 years K. R. Briffa, P. D. Jones, F. H. Schweingruber, T. J. Osborn NATURE |VOL 393 | 4 JUNE 1998 on page 451