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the top visualize networks related to the viewpoint “battle”, and the bottom
ones visualize networks related to the viewpoint “gift”. Figure 8.3 also
visualizes TimeSlices with different timings. We place TimeSlices at the left
in the position for 1573 and TimeSlices at the right in the position for 1615.
We can observe big communities around ODA Nobunaga in the
“battle” TimeSlice in 1573, but a small cluster with few nodes around
Emperor Ogimachi in the “gift” TimeSlice. In contrast, TimeSlices (both
at the top and bottom) in 1615 have big clusters around TOKUGAWA
Ieyasu and have many common nodes (in light green).
We can assume from the results that only a few daimyo such as
Nobunaga connected with the Emperor through exchang of presents. Most of
them were connected by fighting around 1573. However, most daimyo
connected by exchanging gifts with the Tokugawa family as well as battles
around 1615.
These visualizations enable us to compare changes in the formation of
clusters, key persons, and differences and similarities among different
viewpoints. However, it is still difficult for us to recognize detailed
characteristics of relationships between people from these results and to
establish whether the relation was a hostile or friendly one.
In Figure 8.8, we add colours to represent characteristics of
relationships mentioned in Section 5 to the network related to “battle”
described in Section 7.1 and then visualize their changes.
Figure 8.8 (a) shows that there are many edges with a high ratio of blue
around ODA Nobunaga and ASHIKAGA Yoshiaki. The interpretation of
this is that they tried to build friendly relationships with other people.
People around Ishiyama Hongan-ji are connected by blue edges in 1573 in
Figure 8.8 (c). In this case, these people are known as an anti-Nobunaga
group. We can then see many red edges appear in 1576 in Figure 8.8 (d)
and can recognize some famous commanders under Nobunaga in the same
cluster of people (around Hongan-ji). These represent Nobunaga attacking
Hongan-ji with many commanders. Figure 8.8 (c) shows that there are
many red and thick edges around AZAI and ASAKURA. These represent
the battle (Nobunaga vs AZAI and ASAKURA) described in Section 7.1.
Figures 8.8 (b) and (d) represent people belonging to the anti-
Nobunaga encircling network as huge nodes. We expect that they would
have red edges to Nobunaga, but some famous daimyo do not. Although
UESUGI Kenshin changed from being an ally of Nobunaga to an enemy,
the edge between Kenshin and Nobunaga does not change from blue to
red. We assume that the historical documents we use in this chapter do not
include enough descriptions about hostile relationships between Nobunaga
and these daimyo.
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